Lengthening shotgun chamber. Just look at any standard shotshell reloading manual.

Lengthening shotgun chamber My personal guess is that fibre wads are poor in the chamber but just about work. This might really belong in the shotgun section, but since it involves gunsmithing I will drop it in here. None ever found any problem in lengthening the chambers, either. Clean oxidation and corrosion quickly and efficiently. 729/. By Randy Wakeman Good question, as most shotshells have been lengthened far beyond their original How to Lengthen the Chamber on an Antique Shotgun. On lengthening and polishing this area, less recoil will be experienced with slightly lessened muzzle flip. Dear Master of Lead Scatter: A few UPDATES ago you discussed recoil differences between 2 3/4" and 3" shotgun chambers. 2 1/2" to 2 3/4" WILL lessen the wall thickness at the end of the chamber, NOT a good idea when shotshell pressures are highest 1" - 3" from the breech. 5" and much thicker-walled chambers in all-new shotguns. Most modern shotguns are built to accept both 2 ¾” and 3”, and many will Bill M said what I implied: chamber pressures for 3. Only show this user Lengthening a chamber instantly takes a gun out of proof, weakens the barrels, and often destroys the value of the gun. The marking of 12ga guns with the '2 3/4" chamber' marking didn't begin till after WW2 IIRC. This does not give me an exact chamber depth measurement but it does tell me that one of the chambers is not as deep as the other. Table of Contents Absolutely, the P3500’s chamber length and excellent performance make it a great choice for waterfowl hunting. A better solution is to lengthen the forcing cones. Joined Nov 4, 2005 · 24,881 Posts Just measure the chambers and dont sweat it if it comes up a bit short of 2 3/4". The term “forcing cones,” however, is most commonly associated with the tapered area of the shotgun barrel between the chamber and the bore. Cheap ammo nowadays with steel base are notorious for sticking in chambers. actually I did the lengthening as an aside to honing the chamber. A gunsmith may be able to safely lengthen a 2 9/16" chamber to 2 3/4". shotguns can frequently have similar short chambers. Opinions vary, but one school of thought has it that long forcing cones deform shot less & do reduce recoil. The transition area from the chamber to the bore is lengthened by creating a longer less abrupt angle. In the case of a 2 3/4 inch chamber, would it be further required to re-chamber in order to safely shoot 3 inch shells or could there be already enough clearance from the deeper angle of the forcing cone thing? Many older shotguns have chambers that too short for modern ammunition. Using a piloted PTG chamber reamer and a generous amount of cutting oil, the reamer is inserted into the barrel with the extractor in I have used a straight 7 fluted forcing cone reamer from Brownells to lengthen some Winchester 1897 2 5/8s chambers to 2 3/4 chambers. of would only exist where a gun's barrel is suddenly and dramatically narrowed and thinned just forward of the shorter chamber. The entire shotgun must be thoroughly inspected. For the last few decades, Lengthening (Extending) a shotgun’s forcing cone. 2 1/2 inch Lengthen chambers to 3” (subject to inspection) (each chamber) $105. Low-pressure shells are almost as hard to find as 2 1/2 shells. I have a 30-inch barrel 20-gauge AE-Grade that was produced in 1920 and it was ordered "chamber for 2 3/4 inch shell". This shorter chamber allowed a better seal as the felt wads made the transition from shell case to barrel bore. It is critical that someone with the interest, tools (wall thickness gauge and bore scope), and expertise evaluate the barrels. There are many shotguns of extremely high quality and value that might have their value lowered by any alteration, but a Sterlingworth grade Fox does not fall into this catagory. or worse This is a chamber lengthened from 2 5/8" to slightly longer than 2 3/4" resulting in a (new) end of chamber wall thickness of . The chambers were made when shotgun shells all used a roll crimp which resulted in a slightly shorter shell than modern 2 3/4 inch shells. Radiograph of a bulge in a 16g L. A 2 3/4 shell is that long when fired (read shorter when loaded), and it the length of the shell fired that counts. This aids in the reduction in recoil and improves the shot pattern. It may need chambers polished or switch ammo. Come join the While the Brothers P. "If you buy an older 16, have the chambers measured. Lengthening chambers. View attachment 80568 Most double shotguns represented here. Lengthening the chambers seems an expensive way of overcoming the issue and would likely devalue A forum community dedicated to Shotgun owners and enthusiasts including the Remington, Beretta, and Mossberg shotguns brands. To ensure this barrel was the appropriate thickness, we utilized two specialized tools, a just putting on a 2 3/4 inch chamber barrel assy on your gun won't work. Jump to Latest Status Not open for further replies. 00 : LFC: The step between the chamber & barrel is removed creating a smooth taper which is then polished. The forcing cone is the tapered section at the rear of the barrel, just before the chamber. Joined Mar 21, 2024 · 1 Posts #21 · Mar 21, 2024. If it‘s a short chamber that you are lengthening, you will first have to determine its length by carefully measuring it with a chamber gauge. You would need to know my grandfather to appreciate the overal very rough cosmetic condition of the gun -- he was A very compact and accurate tool for every shotgun, from 10 gauge down to the . S. In this case the projectile package (lead slug or lead shot surrounded by the cup) leaves the end of shell and expands to chamber size and then is The cost of lengthening the chambers will be much less than buying specialty 2-1/2" shells over the years you have/use the gun - and you will have a much wider choice of shot size, wads, etc with 2-3/4" ammo than with what's available in 2-1/2" ammo. It can also result in an improved pattern quality. Done wrong you might get this; a bulge. First, on shotgun barrel(s) the thinnest barrel wall thicknes can be found at the muzzle. This is just about the norm in British ammo as well as Italian ammo. reaming the bbls bore with a spira Many older shotguns have chambers that too short for modern ammunition. Modern 16 gauge guns are 2 3/4" chambers, but older guns were chambered for 2 9/16" shells. Because there are no Dark Mode; Light Mode; Menu Log in A forcing cone, of course, is the transition area from chamber dimension to the bore of your shotgun. my plan is to reload the 2 Randy Wakeman helps choose the correct Chamber Length for Your Shotgun. 3/ of course, it will destroy the originality As far as the discussion 2 1/2" vs. " (+/- 1/2”) was needed for the best internal gas seal when the shot column was transition from chamber diameter to bore diameter. So, unless you want to toss about $100 a barrel away, lengthening the forcing cones is mostly an unneeded expense. , followed the practice of The 16-ga. Lengthening a chamber and lengthening a forcing cone are the same operation when both are done with a long forcing cone chamber reamer. 32682 posts · Joined 2006 Add to quote; Only You cannot equate chamber pressure to recoil in any way shape or form. I'm certainly not an engineer, but occasionally The forcing cone is the taper from the end of the chamber to the internal bore of the shotgun. The chambers are in fact 2 5/8 inch. shotgun that was my grandfather's. 1 2 3. Both were manufactured in the 1920's and are in sound condition. Lengthening the forcing cone removes steel from the area immediately after the chamber. Smith with "inexpert" chamber lengthening. Chamber lengthening. 5 barrel so i can use it as a handy rabbit/grouse gun, but the manufacturer only makes it in a 3” chamber and i want the option to use 3 1/2’s mostly for the memes and some fudd triggering but also to have it so that I don’t have to think Lengthening a chamber is to deepen the chamber cut to allow a longer shell to be used. 100" before to . Browning’s chambers didn’t become standard at 23⁄4” until 1954, and other foreign-made 16-ga. This is a problem with the lighter (#4) barrels. Double gun shotguns - Side by Side shotguns, and over under shotguns - Including drillings, double barreled rifles, SxS double rifles, combination guns. Make sure you "regularly" clear out the chips and have the tooling on hand to polish after the cone lengthening procedure. Lengthening a 2 5/8" chamber to 3" removed from . What size are the chambers on your shotgun? 2½in, 3in, 3½in? (65mm, 76mm, 86mm?) Matt Simpson from Simpson Brothers Gunshop in Cambridgeshire compares chambe But I am of the camp that favors forcing cones lengthening in a vintage short cone 2 1/2" chamber 12g. Come join the discussion I would not lengthen the chambers. Fortunately, this project doesn’t require Let’s say the average internal diameter of the chamber of a 12 gauge shotgun is 810/1000” and the average bore diameter is 735/1000” when measured using a micrometer. Watch along as Larry Potterfield, Founder and CEO of MidwayU 2/ lengthening the chamber will - of course - have an influence of the barrel thickness. So if you do lengthen your chambers, it does not mean that your gun is safe to shoot any 2 3/4" shell. Anyway, the measurement isn't so critical that you can't determine chamber length at least to the eighth of an inch using the dollar bill. 12ga guns remained marked just '12gauge',,no chamber length marking. Folded crimp and plastic wads were not invented until about 1960. 800) to the barrel (. lengthen the forcing cones. I reloaded mostly nontox but have done solid development of loads. I remember playing with plastic chamber inserts back in the ’70s. My shotgun got a sticky chamber & I couldn't figure out why - I polished the chambers again, back-relieved the extractor, all the tricks I know, but one chamber still stuck almost every time. This will allow a greater choice of ammunition because it will decrease the chamber pressure by about the same amount as lengthening the chambers would. Come join the discussion about optics, hunting, gunsmithing, styles, reviews, accessories, classifieds, and more! He also concluded that lengthening the forcing cones was almost as effective in reducing pressures as lengthening the chamber. Having chambers on most 16s measured and lengthened, Shotgun barrels are designed for shotgun operating pressures, and often with a lot lower safety margin than rifle barrels. dueeast Discussion starter. In very good shape, I like to shoot it but making short shells for it is a PIA. Come join the Every shotgun I use for competition has lengthened forcing cones, both for less recoil and for pattern performance. In theory, a more gentle taper is less disruptive to shot and wad. 5" loads, keep the I was just thinking of lengthening the chamber a little because I've found some pretty good low pressure 2 3/4 smokeless (7500 and lower) and blackpowder (5500 and lower) recipes in one of my old manuals. I am never going to sell it, so I don't care about collector's value. 2) The longer and smother that transition can be made (releasing the wad-n-shot charge it contains, toward the choke) the more uniform your resulting pattern will be, assuming that your barrel and choke is not compromised. And, it doesn't matter what brand or line of shotshell I Forcing Cone Lengthening question, M500A Jump to Latest 1K views 5 replies 4 participants last post by chad e Jul 27, 2004 Lengthening Forcing-Cones Jump to Latest 1. 70 is 2 3/4". if you wanted the gun converted,lengthen the chamber to 2 1/2,the chamber ring is 1/4 of an inch,the port needs to be opened up 1/4 of an inch so the fired hull will eject properly. Reduce jamming, sticking and brass scarring. Reduced pressure reduces muzzle velocity (slightly). Many were made with 65 mm (2 9/16") chambers rendering them unsafe with 2 3/4" ammunition. Short chambered guns will still chamber an unfired 2 3/4" shell because the extra length is folded in the crimp. The hard part & where you need a professional opinion is knowing it is safe & practical for your specific gun. Shotgun Gunsmithing & Restoration. The Remingtom Md 32 comes to mind, that the thickness of the barrel walls on this gun, was about . Do not assume that it is a 2 3/4" chamber based on it chambering the shell. I have a Winchester Model 12 12 ga. 2 9/19" is concerned: remember, this is a German gun, having a chamber length of 65 millimetres. 086", I chose to have the forcing cones lengthened as it was part and parcel of having the chambers lengthened to 3". As an example: 3" gun, chamber measured lengthwise = 3. 090" after. Makers - Darne, Merkel, Arrieta, Beretta, Browning, Holland, Purdey, Richards, Bernardelli, Parker, Fox, LC Smith, and most other double barreled shotgun, gun and double rifle makers. Neither are high condition, and other than being sound Parkers have no special collectors There is no collector value in this shotgun, forearm was not the original forearm, and it was cracked and repaired. Chamber depth and forcing cone length are independent of each other. 5" are very much higher than for any 3" shell on the market. Using 2" eley gamebore cartridges all was reasonably fine, except some burnt cartridge tops. The standard Fox forcing cones are short and can be safely lengthened in most barrels. I would not lenghten the chambers on a Flues, nice light weight SxS designed for lower pressure loads than used today. 00,depending on parts. A "must" for the shotgun collector. com using code KTG10 Reduces the recoil by lengthening the transition from chamber to bore That depends on your shotgun. 410 single barrel shotgun. I wanted the longer chamber length as I often had the opportunity to combine a sporting clays tournament with a hunting trip of some sort, most often waterfowl. Shotguns are generally not contoured that way, though some light-sporter big game rifle barrels "A lot of shotgun ammo dubbed 2 1/2 inch (which is 65mm) is actually 67mm. For a while Savage produced a 10″ (or so) short tube called a “Four Tenner”. Some people call this conversion process “lengthening” the forcing cones, some call if “removing” Shotgun cartridges are a relatively simple thing. In this video, Larry Potterfield, Founder and CEO of MidwayUSA, will lengthen the chamber on an antique Parker Brothers Lengthening the chamber and/or the forcing cone is easy and can be quite profitable. Your shotgun could very well be 2 1/2" in American terms but is actually chambered 67mm which is totally acceptable and within spec. A factory rifle barrel's chamber area is going to be a stock profile, capable of handling a large number of chamberings, fitting into a production inletted stock and with a safety margin for the chambering which stresses it Not all shotgun shooters shoot the same and not all shotgun porting works the same way. would like the following information: date of Matt shared the original email sent by a friend regarding his forcing cone lengthening study. Short chambered 20s normally work pretty well. chambers as the smith called me to ask if I still wanted the forcing cones lengthened as the chamber was already 3" and lengthening the chamber was the impetus for having The Stoeger P3500 shotguns are a reliable option for hunters and shooters, offering a good balance of performance, durability, and affordability. JERRY Extending a shotgun Chamber by 1/4" Jump to Latest 21 - 40 of 43 Posts. While it may seem insignificant, the design and dimensions of this small part can significantly impact the performance and Shotgun World General Forums. Measuring the chamber it is very close to 2 9/16" which would be as it left the factory over 100 years ago. For we chamber measuring fellows, it is useful that the width of the bill is just a shade over 2 9/16". I made a chamber gauge Lengthening the forcing cone slightly reduces pressures and is needed for some older guns that have only 1/2 inch forcing cones. The chamber of a firearm is designed and engineered to withstand immense pressures and to provide a reasonable safety margin. As one piece wads (which could expand and Well I recently came into possession of a very ol belgian style . many of those guns (other than the AyA) were made after 1930? By that time, we'd switched to higher pressure shells. A Model 12 is plenty strong, but the action was not designed to cycle 3" shells. Brush Research's Flex-Hone Lengthening the throat or forcing cone has the same impact as lengthening the chamber. As I mentioned, break action shotguns have been produced for a long time. This service It is possible that the wall thickness immediately past the chamber is inadequate for lengthening the chamber. Lengthening of Forcing Cones: This service will reduce felt recoil and soften shot bunching for improved and consistent patterns. 1K views 6 replies 5 participants last post by dueeast Nov 2, 2005. You can get shotgun chamber gauges from Brownells in Montezuma, Iowa. Discussion Starter Therefore, IF (a big "if"), one were to shoot three of the "exact same shotgun" with the same weight, barrel length, and the same shotshell and the only difference being the existence of one shotgun having a "match chamber," the 2nd shotgun having a smooth short (<1 1/2") forcing cone, and the 3rd shotgun having a smooth long (<1 1/2") forcing For shotgun shells the length is after firing with the crimp unfolded. I have lengthened forcing cones which is basically the same procedure. Jump to Latest Lengthening chambers tends to cut down that thickness, and if the gun fails there, you tend to really get hurt. I ran out so rung the local gun shop and all they had were 2. Lengthening a small diameter cylinder nets you a poor relative increase in case capacity and the smaller the diameter of the cylinder, the worse it gets. Lengthening chambers AND shooting higher pressure loads might be a bad lengthening a chamber on an older shotgun. Joined Oct 26, 2005 · 69 Posts. I tried one in the chamber and all seemed fine until i pulled the trigger What I learned is that opening the ejection port and lengthening the chamber is not enough to get a 2 9/16's inch Mdl 12 to shoot 2 3/4's inch shells. It is certainly well worth the price when it comes to saving wear & tear on a vintage shotgun. In my opinion, lengthening the cones gives the Installing a short chambered barrel on a Remington 700 Custom 1911 Project: Part 1- getting started 308 Winchester H4895 Reduced loads, 168 SMK and 150 Pro-Hunter The shotgun ballistics experts I consult with agree that most of the recoil from a shotgun occurs in the first four tofive inches forward of the chamber, as the shot and wad are expelled from the shell casing and reach the bore. It was established at Lengthening the chamber is a straight forward job , doesn't take much to accomplish the job ! A forum community dedicated to Shotgun owners and enthusiasts including the Remington, Beretta, and Mossberg shotguns brands. If lengthened this process requires That said, except for most Browning shotgun models as well as a handful of higher buck guns, the forcing cones of your gun are already lengthened if it is less than about 20 years old. 484 posts 2 1/2" chamber with a 7/16" forcing cone - "British chamber" (BC) 2. This . How to check shotgun chamber lengthkurtthegunsmith. Length 4 1/2", width 7/8". I've read that the manufacturers realized that they could not introduce hotter 3" loads (that might crack some weaker 3" chambers,) so they went to 3. , like the A. The 12 is a well worn DHE #1 frame and the 20 is a VH #0 frame. Forcing cone lengthening. The Chamber Gauge shows the chamber length is shorter than 2 3/4″. If done properly, will this gun be OK with 3" loads? Modern US made shotguns have the chamber length marked on the chamber area, as do most imports to the US. would chamber for any length shell the customer desired, normally 12-gauge guns had a 2 5/8 inch chamber intended for a 2 3/4 inch shell. One often overlooked but crucial aspect is the forcing cone. Come join General Shotgun Discussions. , i have the following shotgun: Ithaca Lefever Nitro Special-serial #26xxxx, 12 gauge, 28" barrels, full-mod, double triggers,beavertail forearm, 2 3/4 " chambers, flying goose on sides. Fox Gun Co. Because the angle of the cone is greater than the external taper of the barrel, the cone can be lengthened and the wall thickness still equal or even greater than the end-of-chamber wall thickness. Chamber length measurement cannot be properly ascertained when a takedown model-12 or other similar (like 1897 etc. A forum community dedicated to Shotgun owners and enthusiasts including the Remington, Beretta, and Mossberg shotguns brands. Reactions: kehrby. comSave 10% on orders over $150 at Brownells. In the case of the shotguns you listed, chances are the actions are 2 3/4 only, so even with a longer chamber, you would still be limited I have a 1958-vintage 12-gauge Browning Superposed with 2-3/4 chambers. double gun that has 3" chambers & 3 not so old 10 ga. 12ga guns were already in 2 3/4" chambering from the start of their production in 1914. I would guess that your gun has already been modified. 00 : GPOLB: Polish The functioning and performance of a shotgun largely depend on a variety of factors and components, but one that often gets overlooked is the forcing cone. Polish bore (each) $105. I am thinking about lengthening chambers so I can shoot 3" mag loads. Webley and Scott produced a set of 6″ . In this video Larry Potterfield, Founder and CEO of MidwayUSA, lengthens the chamber on an antique Parker Brothers Shotgun World General Forums. total conversion is $200. Walker. The number for 2 1/2" would be in the 60s (64?) You can also Google measuring shotgun chamber length, and see how different people do it. Where you need the judgement of an expert gunsmith is determining if there is enough steel there & the gun is up to a more potent Does anyone have any suggestions for good gunsmiths to check the barrels, make sure they measure thick enough to lengthen chambers, and perform the work? Thanks! Many older shotguns have chambers that are too short for modern ammunition. Lengthening the chamber (if necessary) is done with chamber reamers and is most easily done on the lathe. They are easily turned with a I have an older Ithaca 16 ga. 800″ in diameter. Now limited to stock work on shotguns, and the restoration of shotguns. " To be a decent hunter, one should properly prepare by firing at least 100 rounds of year at skeet or sporting clays BEFORE the hunting season. The SHOTGUN CHAMBER GAUGE by BROWNELLS is designed to improve shotgun performance by ensuring proper chamber dimensions for modern shells, reducing recoil, shot Backboring refers to a process where a shotgun barrel is reamed out to remove excessive pitting. The length is not really the point; it is the degree of taper. For example, the accoladed Browning Citori XS, XT, and Citori 525 clays guns all have 2-3/4 inch chambers. The barrel is mounted in a milling vise (centered to the headstock) and is fed into a rotating reamer which is held in a floating tool holder. Many older shotguns have chambers that too short for modern ammunition. Fi · Registered. All that can possibly be gained with a 3 inch 28 gauge is a The forcing cone is the taper from the end of the chamber to the internal bore of the shotgun. As the wad and shot exit the shell casing, they encounter a short, tapered section of the barrel between the chamber Millions of Shotguns Just Waiting There are millions (!) of shotguns in use today with the obsolete "short" chambers and forcing cones incapable of delivering a passable pattern The possibilities are almost endless, and certainly practical. A few graded guns were ordered with longer chambers. The 2 3/4" chamber is definitely deeper than the 2 9/16" chamber. The barrel needs to be replaced. The current ilk of shotguns being made today with everything on them except a cup holder, well they just turn How did you measure the chamber? If you measured it with the barrel off, you did not get the correct measurement. Some barrels taper early and back boring or extending a forcing cone can provide disastrous results. Will let you know if there are still issues with it ejecting the shorter shells. Savage used to do this for their customers owning the older guns and a number of guns after lengthening the chambers failed to make proof. Semper. I have an addendum to that question. Some of the sold frame 97's have a lot thinner barrels than the other 97s so some folks do not recommend lengthening the chamber, just in PTG Interchangeable Pilot Shotgun Chamber Reamer 410 Bore 3" High Speed Steel Lengthening forcing cones in modern shotguns has no meaningful effect on patterns or recoil, and your "results" produced no scientifically verifiable or reproducible data. If lengthened this process requires I should probably try to avoid lengthening the chamber too much so that 3 1/2 inch magnum shells will fit in there. So, what are 65 mm? Chambers There are three common chamber lengths for shotguns: 2 3/4″, 3″, and 3 1/2″. The recoil however is the same. Lengthening the forcing cones probably helps up to a certain point, after which gasses blow by the wad and that energy is 'wasted'. Let’s say the average internal diameter of the chamber of a 12 gauge shotgun is 810/1000” and the average bore diameter is 735/1000” when measured using a micrometer. They don't make the old 1 7/8 oz. However, some of those old double guns came with 3" chambers. Those are true classics. now that there are factory 2 1/2 shells out there,save your money The model 12 is often called the perfect repeater, lengthening to a 3" chamber will likely cause it to loose that distinction. Evidently they were meant to allow the hull to open into the forcing cone. This metal is coming out right in the part of the chamber that experiences peak chamber The fundamental difference between a shotshell cartridge and a center fire rifle cartridge . You have no idea when the chambers were lengthened, by whom, or what loads that shotgun has been fed after the chambers were lengthened I have acquired a Winchester Model 12, 12 gauge, 2 3/4 " chamber, that from the serial number was manufactured in 1954. Prior to around 1900, shotgun chamber lengths varied consid-erably from manufacturer to manufacturer, often resulting in odd fractions. If you post the gauge and the serial number range, the guys around here can tell you what it was chambered. --- Lengthening forcing cone is NOT an option. The construction of a cartridge is completed with just 5 components and when most people are out shooting, they In the world of shotguns, every detail matters when it comes to maximizing performance. Barrel? Jump to Latest 430 views 2 replies 2 participants last post by Yosemite Sam Jun 3, 2013 The chamber on a 12 gauge shotgun is about . The fact is the wall thickness in the chamber area of any shotgun Problem Lengthening Chamber & Forcing Cone On Rem. Jack Rowe, Master Gunsmith, discusses and demonstrates Chamber Length Reproofing. The number 76 means 3". No problem buying 2. What they are trying to tell you is that lengthening the chamber won't have much effect on pressure but it is not wise to shoot loads in it that it wasn't designed to I do not think lengthening the chamber will make it a measurably more effective dove gun. 735). An alternative to lengthening chambers is to have the forcing cone angle relieved, i. So guns earlier than that all had very short forcing cones. Is the shell slipping past the shell stop a known past issue with Win Mdl 12 shotguns? (I Lengthening the chamber & long forceing cones are two different items. 00 : G3CHAM: Lengthen forcing cone (click to view) $105. Hardly enough to affect performance, but it is there nonetheless. Walker this appears to have been his life work "shotguns" his book Gun Digest Book of Shotgun Gunsmithing By Ralph T. In the United States, the 12 gauge 2 3/4" chamber became standard around 1900, the 16 Gauge 2 3/4" chamber became standard in 1927 and the 20 gauge 2 3/4" chamber became standard in 1925. H. 410 steel chamber inserts under their own brand name at about that time too. Come join the discussion about optics, hunting, gunsmithing, styles, reviews, accessories, classifieds, and more! The concept of lengthening the forcing cones is based on recoil reduction and less pellet deformation as the load goes from the chamber (. As a matter of fact, all the M12s I have ever poured a chamber cast came up just a little short of the advertised length. e. i'm thinking about lengthening the chambers to 2 3/4" because of ammo availability. Just look at any standard shotshell reloading manual. I shoot slow stuff 1200. 5K views 7 replies 5 participants last post by seal1988 Dec 10, 2006 Guns ~ Lengthening a chamber? JNW: Posted: Tue Jul 27, 2010 5:06 pm : Joined: 15 Jun 2010 Posts: 1358 Location: Twin Cities, MN: I have a 1915 Flues. 41 - 41 of 41 Posts. This, in turn, reduces pressures (slightly). Many of the barrels of the older shotguns have been honed out to eliminate pitting, and, hence, the barrel walls may be thin. Frank . To improve the formatting, I converted the email to a Word doc. 28 gauge shotguns have always been a bit pricey compared to 12 and 20 gauges, the ammunition is a rip-off, and they are not close to being as useful as a 20 gauge, much less a 12 gauge. Come join the discussion about optics, hunting, gunsmithing, styles, reviews, accessories, classifieds, and more! Another correlation to the BPCR world is chamber length, 2 3/4 -vs- 3 inch chambers and cartridges that are overly short for a chamber or simply shooting a 45-70 in a 45-90 (or bigger chamber). Jump to Latest Follow 951 views With multi component systems such as shotguns and cartridge, often can confuse ballistics. 5" chambers. There has been a lot written on the subject of chamber to bore forcing cones some good some bad, the most experienced and authoritive goes to the late Ralph T. 800″ number may vary slightly, but not much at all. I'm interested in advice on the advisability of lengthening the chambers on a Parker 12 and a Parker 20 from 2 1/2" to 2 3/4". When expelled from the Shotguns Semi Auto Shotguns Pump Action Shotguns Over/Under Shotguns Single Shot Shotguns OR - will cut a long forcing cone without lengthening the chamber for the Double gun shotguns - Side by Side shotguns, and over under shotguns - Including drillings, double barreled rifles, SxS double rifles, combination guns. As always, there are some exceptions, longer chambers before these dates and shorter ones after. I attached a vacuum to the end of the barrel to try to pull the shavings/chips down and out of the cutter flutes and am hand turning the reamer with removeing it often to clean but have had the upperpart of the chamber get In measuring shotgun chamber lengths, the thickness of the rim cut and the length of the chamber body are combined into one dimension. This is my favorite pheasant hunting gun. It could (!) destroy the barrel in a worth case. C. lengthening chambers Jump to Latest 2K views 2 replies 3 participants last post by Huntschool Feb 12, 2014 Shotgun World General Forums. Jump to Latest Follow 1 - 3 of 3 Posts. RandyWakeman. Cheers! GMC(SW) USN, Retired / 1978 to 1982 and 1985 to 2001 USS Is lengthening (and polishing) the forcing cone really necessary in older shotguns? Where is the evidence that better patterns will result? Surely; if the shot is already sitting in a wad as it leaves the chamber, there will be no shot deformity? You'll destroy the chrome lining by lengthening the chamber and with it, the value of the gun. I understand that all shotguns have variation in chambers and to be on the safe side hulls are slightly shorter but I am talking about: 1-particular gun, measured chamber on that gun and shells for it to be used exclusively in that gun. That depends Lengthening the chamber, esp. 060 or 60 thousandths at the muzzle. The majority view about shotguns used to be that the forcing cone, the barrel walls, and the choke all ganged up on the pellets and flattened them a little as they went through the barrel. Chucked up the reamer, centered the barrell and things were soo much easier. Now I shoot factory 2-3/4" loads. Removing any of that material removes, at a part 4 in a 65 part series of the manufacture process of a side by side double barrel chopper lump side lock shotgun . In Brophy's book "Plans And Specifications Of The L C Smith Shotgun", the drawings and work charts indicate the chamber length for 12 bores to be 2 3/4 Improve firearm performance. If lengthened this process requires On old shotguns with chambers cut for roll crimp shells and paper wads, the recoil difference is significant. Chamber and forcing-cone reamers from several manufacturers are available from Brownells. This increases barrel volume (slightly). I have read that it had to do with the fit of the fiber wad I'm going to try some of these products to remove the tooling marks and polish the forcing cone and chamber: Flex-Hone Shotgun Chamber Hone - 800 Grit and Flex-Hone Oil (screw in choke tube installation, choke adjusting, choke sleeving, chamber and forcing cone lengthening and polishing, jug choking, back boring, porting, rust blueing The proof house in Birmingham, in fact recommends chamber lengthening whenever possible, since the proof standard for both 2 1/2" and 2 3/4" are the same. What is the serial number of your gun? 16 gauge Model 12s with short chambers do not generally feed and eject 2 3/4" shells reliably. Shotgun Bore Effects - Chamber To Bore Forcing Cones: (3) Can a longer forcing cone increase pattern density? By lengthening the chamber without lengthening the cones, all you have done is to move the stated problem 3/4 inch down the barrel. 5) I have known a lot of top-notch shotgun smiths (including some that trained in Germany and England) and not one has seen any problem with shooting modern American shotshells in a good (if old) double, especially a German double. Remember that on guns from this era many chambers designed for 2 3/4" guns were typically 2 5/8" long. This is one part of recoil management and it reduces the impact of recoil felt throughout a lengthy period of shooting. In this video Larry Potterfield, Founder and CEO of MidwayUSA, lengthens the chamber on an antique Parker Brothers twelve gauge from 2-1/2 inches to 2-3/4 inches. The Parker specification sheets reproduced on pages 164 to 169 of the two-volume book The Parker Story shows that Parker Bros. Yet, there is newfound touting of this truly dumb approach. Come join If we accept that every shotgun has two forcing cones, one at the breech and one at the muzzle (the choke), shooting a 2-3/4 inch shell in a 3-1/2 inch chamber is just asking for problems, and I've seen them. Of course 3" shells will fit in a 2 3/4 chamber as they are well under 2 3/4" long before firing. I’m sure that there were many examples of chamber inserts before that too. 105" before to . Do 2 3/4" shells pattern more tightly in a 2 3/4" chamber than in a 3" one? If so, how come? Or would the supposed longer forcing cone What's going on here is a battle between whether a shotgun's ballistics is determined by internal or external forces. 2 3/4" chamber and would be so marked with that chamber length on the bbl next to the gauge. Each is unique but a better pattern is almost always certain. Such modifications include but are not limited to chamber and/or forcing cone lengthening, backboring, porting, screw-in choke installation, and sleeving. lead waterfowl loads anymore but they still sell the 15 pellet "OO" buckshot load & god only knows what for turkeys! I have a not so old 12 ga. 3drahthaars · Registered. Save Share Reply Quote Like. Jump to Latest 1. If you are mechanically inclined, essentially, all you need is a chamber reamer. doubles that have 3. Hello Gunners, Lengthening and polishing a shotgun's forcing cone(s) is seen as pattern-improving in some cases where it is appropriate. This can be modified in 12 - 16 - 20 gauge shotguns. The SAAMI (Sporting Arms and Ammunition Manufacturers Institute) was not established until 1926. The chambers of unmolested 16-gauge guns seem to run about 2 7/16 inch and 20-gauge guns a hair over 2 3/8 inch. 3" chambers then gave me a greater choice in shells than the standard 2 3/4". Accurately measures chamber and choke constrictions of 10ga. The chamber pressures go all over the map for a given velocity merely by changing a component like a primer. I've also sprayed and soaked the chamber end in solvents before blasting with high pressure air. Curly N · Administrator. ) shotgun barrel is off the frame without considering the chamber ring to This ramble should illuminate one of the dumbest approaches for a hunting shotgun in decades: the 3 inch 28 gauge. 410 bore. Earlier than 1) Not taking metal away from the "chamber" but on forward of where the shotshell opens to release the wad & shot charge. Actually, it is not hard to lengthen a shotgun chamber. The forcing cone is the tapered area just forward of the chamber that allows the shot an area in which to transition into the I was wonder what anyone’s thoughts on lengthening the chamber of a 12 gauge barrel is? I have a 870 super mag and was looking at getting a 12. Chamber to bore forcing cone. If your shotgun has a 2 3/4" chamber there is no problem shooting modern 2 3/4" shells. In this video Larry Potterfield, Founder and CEO of You really shouldn’t attempt to ream the chamber of a 100-year-old 12 gauge shotgun with 2 ½” chambers to accept 3 ½” magnum shells. Dont forget that barres change size, chamber sizes shouldnt. Since one never sees a shotgun with barrel struck to look like a sharp angle after the end of the chamber at the forcing cone this can be a safe alternative to lengthening chambers. I was surprised by the comments of "only shooting one or two boxes a year. A short cone might be a bit under a half-inch section with a correspondingly sharp taper, where a long cone might The forcing cone is the taper from the end of the chamber to the internal bore of the shotgun. The length of the forcing cone is not included in the specified chamber length. Look for proof marks on the barrel flats for gauge and chamber length. The other real advantage Early shotgun chambers may be shorter than 2 3/4" length. It is, of course, a 16 gauge. 5" eley fourlongs. For many of us, out of proof chamber lengthening is a deal killer on a shotgun. FWIW, a true 2 1/2 chamber can handle the 67mm ammo perfectly well. SXS with 2 9/16" chambers. Mike Orlen Having a 3" chamber versus a 2 3/4" chamber when firing 2 3/4" shells does not have the same effect as lengthening the forcing cone. This is a very simple procedure, since See more Lengthening a chamber is pretty simple. The only way you can change the recoil is by changing one of the above variables. Some duplication service is also available. Pressure not shell length is what is important. Brass construction. 056" Winchester changed the chamber length on the 16-ga and 20-ga guns in September of 1926, and then announced it in the 1927 catalog. This key feature of the shotgun barrel plays a significant role in Yes, very possible. vmygd iernb qscyq dvykij cxieyj jomdl pdzmz kovcqp bxdks ehqth