22lr chamber pressure. As far as altering a .

22lr chamber pressure 22 LR chamber can cause excessive pressure, which could result in a catastrophic failure of the firearm. Keep using a new blacked case as you go until a case drops freely in. Because Hyper velocity 22LR ammo like CCI Stinger and Velocitors, and Aguila Interceptor and Super Max, have higher muzzle velocity and energy, something has to give them this extra punch. Various powder types can create vastly different chamber pressures while making the same velocity with the same bullet. The latest greatest gun sport around here is long range 22lr shooting. Jump to Latest Ive used a series of black magic-markered cases to identify the pressure point and carefully used a die-makers file to just dress the offending spot. It will not fit in a . 38 Spc loads in If you need to cut for the rim it will take a little pressure. Further, every 22 LR revolver I have ever seen have . The 22 long is the same as 22 LR, and 22 Mag. A 'standard' . Many . I am not certain how these European rounds can get away with these pressures? Is it due to a different testing method that CIP uses versus SAAMI? I don't think they use the same system for pressure testing. 308 / 7. About Leverguns. It offers the ability to measure and compare rimfire chamber dimensions witho There is a "magic" relationship of about 1422 between Brinell Hardness and chamber pressure to be used. 22 WMR’s chamber pressure is the same as . The notable features of the . 74mm, For openers, 22 LR bullets are soft lead that will obturate nicely with 22 LR chamber pressure of 20 k psi. If you take the same type of firearm and chamber them for . 22 Magnum cartridge in a . 22 long rifle chamber to . 015" short of the rim being flush with the barrel and easily pushed flush with light finger pressure but will As far as altering a . Reply reply Reducing powder load reduces power, which isnt exactly wanted, but can be compensated for by increasing chamber pressure, to up the acceleration while you are still confined. a typical 22 lr chamber pressure is upwards of 25,000 PSI the CB loads chamber pressure will be under 14,000 PSI semi automatic 22's are blow back Because Hyper velocity 22LR ammo like CCI Stinger and Velocitors, and Aguila Interceptor and Super Max, have higher muzzle velocity and energy, something has to give them this extra punch. , voluntary pressure standards for rifle cartridges are set by SAAMI, a member of ANSI. CCI Mini-Mag 22 LR Ammunition - 21 Sharp rounds will chamber and fire in a . 45 ACP, . Yet chamber pressure is the same as for the high-velocity loading of that cartridge. The result is an expanded bullet that seals quite well in a . Tighter chambers like 52D or Vudoo Ravage will see flyers earlier, but can usually produce better accuracy with a clean chamber. 224" bore and is accurate. Ave. $22. 56 NATO, . 22WMR chamber will be case splitting and gas excursion out of the chamber. If you have a recessed bolt face, you cannot. 224. 22 Mag but it is dangerous to fire it; Winchester 22 LR Ammunition - 333 Rounds of 36 Grain CPHP . The . This could injure you and/or damage the firearm beyond . Thus when fired they raise the pressure in the Cylinder & barrel. Key dimensions listed include a case length of 25. Also, after altering you cannot shoot . 22lr. 22LR and . 38 and a . The chamber(s) will be ruined if the rechambering's attempted via a hand-held drill, With a short round, the bullet is sent at full speed into the shoulder of the chamber, producing wear after prolonged practice. 357 case is the same dimensions as the . Now that we understand chamber pressure, we’re ready to move on to muzzle pressure. Minuteman. Included are If the peak pressures are similar, the only way it can do this is if near-peak pressures keep pushing on the bullet for a longer time/distance down the barrel. What is muzzle pressure? it’s not the most efficient choice due to the size difference between the . The barrel will absolutely handle the . 99 . If its your first . Mail List. 22 magnum rimfire chamber pressure: 24,000 psi. I can chamber the "hard stuff" but the additional pressure required to close the bolt makes it a HUGE aggravation. 22 Rimfire. 40mm, powder chamber length of 5. higher sustained My 4" SP101 in . 22LR and the . Contact us Its low-residue performance and optimized chamber pressure, make Federal AutoMatch 40 grain LRN an excellent choice for shooters who want consistent semi-auto performance at a BTW you can create subsonic ammo without changing chamber pressure. Rem 597 Modular Mag Holster . 357 where the . F69FZ Cip 22lr Chamber - Free download as PDF File (. Use of the Stinger case in developing the . Probable result of a . Those CB caps are probably less. 22 magnum? Would it be a problem to shoot the jacketed . Fouling can also cause an increase in barrel pressure, altering the bullet’s trajectory and introducing variables that affect accuracy. 225" at the throat down to . Do these Hyper velocity 22LR rounds exceed the SAAMI chamber pressure spec (which I understand to be Gunsmithing . I had to chamber and crown the blank. In terms of units sold, it is by far the most common ammunition that is manufactured and sold in the world. RSI Pressure Trace II Firearm Chamber Pressure System. ) the maximum Personally, I use current 22LR ammunition marketed as "standard/subsonic/target" without concern. With regard to recoil, both rounds produce a minimal impulse that most handguns should be able to effectively absorb. 62 NATO, and . Kel-Tec actually used the chamber friction A 22LR chamber shouldn't allow a 22 mag cartridge to even chamber, being both too small in diameter and too short. 224~. If you chamber and fire the 22lr in a 22WMR, the casing expands due to the excess space According to the Sporting Arms and Ammunition Manufacturers Institute the . 22 autos. Each step along the way the firearms manufacturer designed their guns for "modern" ammo. 226". 22LR conversion what type chamber would you select? Chamber that will accept all . A. In . In my professional opinion the receiver of the Rem 33 is not strong enough to handle the added chamber pressure and bolt thrust load. 22LR in a . 221 Rem Fireball: 52,000 cup. Nearly all 22 cal revolvers, no matter what brand, have . Sep 13, 2014 47 44 DFW, Texas. The CCI's are jacketed and will create a higher pressure spike than the lead Winchesters. Every Day new 3D Models from all over the World. When the ammo evolved, the manufactured guns Needing information concerning the possibility of having a gunsmith drill out the chamber of a single shot . Another series of tests compared the accuracy of Eley match ammunition with other types, including standard-velocity, high-velocity, and subsonic ammunition. As shown by the list posted by 6string there are a multitude of 22lr chambers all with small variations. e. I'd leave it as is and shoot Stingers or one of the hypervel rnds. 22 mag barrel blank. add to . Links to technical data and drawings for the newly SAAMI accepted Cartridge and Chamber designs not yet included in SAAMI Standards are listed below. For instance, Aguila SSS is a . i. 223 / 5. I know that is a the CB (conical ball) loads were made to replicate black powder load pressures but with modern smokeless propellant so the guys with older antique black powder load only . So, apparently not many have ever found out what actual pressures that manufacturers load their . 1 – 2018 – Voluntary Industry Performance Standards for Pressure and Velocity of Rimfire Sporting Ammunition for the Use of Commercial Manufacturers is probably the one you are looking for. For the 22 short its 23,000psi to 30,100psi. 22LR is a fun round to shoot target and hunt small varmints with. 22LR SAAMI and CIP chamber specs differ, with CIP being smaller. Quite a few folks have reamed out the LR chambers to . 22lr rounds in this rifle again. ) 22lr SP101 The SP101 I have is (now) a . 357 magnum, . 22 Magnum can be effective for self-defense in certain situations, it is generally not recommended as a primary defensive round. Can a 10/22 22 LR barrel have the chamber reamed to 22 WMR and be safe? Or is the diamter of the rest of the barrel an issue for safety? An item of importance overlooked here is that the Diam of the . "Current standards Here's a thumbnail guide to SAAMI max average pressure for most of the chamberings in common use. 22 Mag. 22 LR ammo is rated at 24,000 psi and chamber pressure peaks just as the base of the bullet crosses the B/C gap. 225" cylinder throats, which contribute Its chamber was reamed to match dimensions. 224 caliber bullet in a Chamber pressure: Shooting a . This document provides specifications for a . It is not like a . and even Esten's 22LR Rimfire Benchrest Rifle With and Without a Muzzle Tuner FEA (Finite Element Analysis) of a 22 LR Rifle Barrel Dynamic Pressure Analysis | The chamber pressure curves were generated from strain gauge Chamber pressure for the 22LR & 22WMR are the same. WARNING! Exercise careful firearms handling procedures at all times. Working into it backwards using Quickload, pressure to launch a 30 grain bullet at 800 fps. What happens is high pressure coupled Discover the best 22 rimfire ammo from the experts at Ammo. So here's the question, how high can you take the chamber pressure without getting into serious trouble? Say steel cased 9mm so the base of the cartridge doesent fail. Not because of anything related to the pressure. pdf), Text File (. Besides, a used 22 mag bolt gun isn't all that expensive if you want one. 22 Long Rifle cartridge, including dimensions for the case head, breech, powder chamber, collar, projectile, pressures, and miscellaneous dimensions. If the rifle has a tight enough chamber they aren't recommended. Full Member. 225" cylinder throats so when 20k psi pressure is applied, bullet diameter will expand and be presented to the forcing cone slightly larger than bore diameter. Do these Hyper velocity 22LR rounds exceed the SAAMI chamber pressure spec (which I understand to be Hi, can anyone tell me how is it possible that a . Pressure limits psi in units of 100. Can't go wrong with Aguila Ammo. 50 caliber BMG using CFR's derived method. The Pressure value used for each caliber happens to be the maximum SAAMI safe chamber pressure. The drawings are in the ANSI standards, which are maintained on the SAAMI website. 222 bore so that would be 22LR only. Some cartridges do not have either a PSI or CUP listed, and these values are omitted. 22LR Given a strong enough action, could you cause a 22lr (standard pressure 21,000 psi) to jump up to 50k or 60k psi? I was thinking the easiest and most repeatable way to do this would be to undersize the bore, from standard . Sent it back to Ruger for that and accuracy problems. and that increases the grip of the case on the bullet for a dramatic increase in chamber pressure. Because of out of battery blowups. . The 22 long and 22 long rifle has enough chamber pressure to cycle a semi-auto, whereas the 22 short will not reliably cycle a semi-auto and you will most likely have regular jamming. Rim cut is usually . Actual operating pressures seem to be a closely guarded secret. Nov 22, 2020 #1 Nov 22, 2020 #1 Evening all, The bullet is gone and pressure dropped before the bolt moves a fraction of an inch. 22 magnum bullet through the bore made for . In addition it has a moving separate bolt for the If you intend to replace a barrel in a . 12 Gauge 1¾” 21 Sharp; 25 Creedmoor; 28 Gauge 3″ 5. 22 magnum is . If you have Use the following equations to determine the values you need. Although not directly related, a similar result occurs when firing . The same applies to Aguila Super Maximum Presenting an approach for how the small ammunition manufacturer and technical handloader can best use SAAMI Voluntary Pressure Standards. If you stuff the longer bullet in a barrel lead that's too short for it, it increases pressure, which might result in a blown case rim and hot gases and brass fragments in Even if you rod flexes you going to have more pressure on the top rear and front bottom of chamber. I rebarrel a Mitchel . My example was a representation of "smaller hole = more strength". 15384600 = 42,577 PSI well under the SAAMI Pistol Pressure Specifications (Maximum Average pressure) All Piezo measurements unless specified) Cartridge: Pressure (Max Avg) Cartridge: Pressure (Max Avg). 22 longrifle barrel from a rossi . 22 Magnum. (In fact, there are some old 22s still around that shouldn't even be fed 22 LR HV stuff. from a 18" barrel calculates to just short of 4000 psi. 22 LR chamber pressure: 24,000 psi; . 22 mag. S. Decades later, in 1959, a longer, higher-pressure version of that round became the famous . 2354 "22lr ar buffer pressure plug" 3D Models. Click to find the best Results for 22lr ar buffer pressure plug Models for your 3D Printer. 56 barrel. I typically clean my barrels in 200-400 round intervals to minimize the carbon ring effect. 22LR Chamber hone? Thread starter Gundoc; Start date Nov 22, 2020; Gundoc Sgt. 22 LR, using less powder and generally operating at a lower chamber pressure, generates less noise. FWIW, the 22 Mag operates at the same pressure as a 22LR. 22 Magnum Ammo / 22 WMR Ammo . As these standards are only periodically I'm not sure what you mean by "pressure chart" but the maximum peak pressure for the the 22lr, 22Mag and the 17's is 24,000 PSI. Make a copy of this for your reference. 4500PSI High Pressure Hand Pump 3 Stage Pump Chamber PCP Air Pumpbr>This 3stage pump with in built filters is ideal for filling most popular PCP airguns. NB that the SAAMI spec chamber pressure for the . It might be a little tricky on a 10/22. J. match will drop in about . 44 magnum, . I would have given all 5 stars, but with A match chamber, paired with match ammunition that it likes, will just improve consistency of groups over longer ranges, because the chamber and ammo is within a tighter spec. 22LR bore is . Supplied with glycerin filled high accuracy gauge, hose with 1/8 BSP female thread and features The reason for the warning is the WRF's are sized . @ 24,000 PSI base (Max. AR-15 22lr Buffer Pressure Plug Instructions for Installation and Use Figure 1. Click on the Cartridge and Chamber Drawings link, then go to the SAAMI Standards Page. 22LR may chamber in a . 22 mag with an Anschutz . The 22 Mag gets its boost in ballistics by maintaining the same pressure longer. 22lr being smaller in diameter will fit in a . 22 caliber rimfire ammunition originating from the United States. Say the loader is curious and wants to know the ballpark PSI. 22 LR ammunition can lead to catastrophic failure, causing serious injury or damage. 22lr stinger or whatever. The short distance to the breech opening along with the muzzle opening will lower pressure fast. 223 dia. Pretty low, most of the match stuff is probably in the 11000-12000 In the interests of safety and interchangeability, this Standard provides pressure and velocity performance and dimensional characteristics for rimfire sporting ammunition. This is SAAMI spec using peizo electric strain gauge method. Here's the easy way to check. These drawings will be incorporated during the next revision of the relevant SAAMI Standard. The 4-500 or so additional f/s velocity (@ equal barrel length) of the WMR bullet is a result of more powder, burning for a longer time, producing a higher volume of gas, and accelerating the bullet at standard pressure, but over a longer period - i. Since it's chamber pressure I'm thinking the drop from about 500psi to 0 is during blow-back. They are shooting out to 400 yards and the one thing I don't hear The . NOTE: Dimensional information for cartridges and firearm chambers, along with performance characteristics, is contained within the American National Standards published by SAAMI, listed below. Tags 22LR Chamber Plug , , , Download: free Website: Thingiverse. I wonder if Chief Dave might have that info? From the SAAMI website you can also access hundreds of FREE official cartridge diagrams and chamber drawings for all centerfire ammo types and Shotshells. Cartridges with +P Pressures, list both the standard and +P Pressure. The bolt of the Remington 541-T (left) has nine locking lugs, while the The . While this is happening, the case expands to fill the chamber. 17 HM2 enabled engineers at Hornady to safely push a 17-grain bullet beyond 2000 fps from a 24-inch barrel without exceeding the maximum chamber pressure level of the . a list of pressure standards for rifle cartridges. Easy to chamber - Win 333 Bulk, Fed Value Pack, Wolf MT & ME, CCI Mini Mag, ELEY Match EPS, ELEY Match Extra. As you observe above, a Bentz chamber, often used on custom barrels for semi auto rifles, is a little tighter than the sporting chamber. Smith. Prototype 12 Gauge Shotshell Filler Wad/Overshot Card Punch. when driven by 22 LR chamber pressure of 24,000 psi. Biggest problem was the misinformation on the max chamber pressure for the 22 LR which Newly Accepted Cartridge and Chamber Designs. 22's have something to feed their guns. 22lr barrel is not too tight for a . is sized . 22lr chambers I have been doing a little research on 22 lr chambers, what I have come up with is they are a few diffrent chambers, only 2 that I'm going to talk about the 22lr sporter (normal) and teh bentz which is a 22lr auto match chamber, I think that's correct. 22 and you want to hunt and practice, a standard 457 synthetic or scout model will group great at 50 yards with cheap ammo and just fine at 100 yards. Furthermore, a dirty barrel can lead to increased friction, disrupting the bullet’s spin and stability, which in turn affects accuracy. That is, it converts the 223 chamber to an extension of the bore with a new chamber for 22LR. Check out the best 22LR ammo for accuracy, subsonic, semi-auto fire, and hunting. 22 LR, it shot faster despite lower chamber pressure. Pressure builds as the powder ignites and burns, and the bullet is pushed into the throat of the barrel, then into the bore. Being more expensive and somewhat less accurate, . That's why they can be chambered in the same rifles. Shown in the table below are a few sample calculations of both Projectile Velocity and Barrel Pressure for the 9mm, . Download: free Website: Thingiverse. AR15 to . Is the . 22 Short Ammo Factors Influencing Chamber Pressure The type and quantity of gunpowder, the bullet's seating depth, the integrity of the cartridge casing, and the design of the firearm itself can all influence chamber pressure. 22lr cylinder. The additional SAAMI spec for pressure for the 22lr is 26,000psi to 30,100. 223 while the . 22lr chamber to a Magnum, you can do it. 1), Shotshell (Z299. ) The pressure minimizes bouncing of the assembly during firing. 22 LR barrels, I’m specifically trying to clean the carbon ring out of the chamber. These are typically advertised as 40gr at around 1050fps according to the I remember reading about old 22LR guns converted only to have the rifling wash out after a couple 100 rnds. It came back with the same problems. The pressure which airgun operates is 2000-2900 psi vs pressue in 22lr chamber is arund 22000 psi. drill and check depth, repeat. Most other countries in the world follow the standards of Europe's CIP (Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives or Permanent International Commission for the Proof of Small-arms, Here you go, scroll down to page 6. 002" larger in the 22WMR. ), 22 Short is 21,000 PSI. It has a thin receiver wall that is rather This CUP is a long way under the 52,000 CUP maximum SAAMI pressure. 45acp +P chamber pressures are commonly measured around 17000 CUP This video demonstrates a unique approach to measuring a 22LR rimfire chamber. The bad thing is the sensor needs to be over the chamber. 1 - BoreBuddy Buffer Pressure Plug. Current Levergun Makers. The barrel rifling dimensions are 0. 22 Short can handle higher pressure because there is more material left around the chamber(s). I have SAAMI Pressures. Is pressure Bulk 22LR Ammunition Testing – Chapter 2 – Performance & Accuracy. On the Standards Page, choose your ammo type: Rimfire (Z299. 22LR "pressure plugs" The CMMG converter is a bolt with a device on the front that pushes into the AR15 223 barrel chamber to allow a 22LR bullet a smooth transition into 223/5. then changed to higher pressure rounds. In the U. 38 Colt: 12,000 cup. 224" Because of this pressure I only shoot the Winchester's as they are lead. 2), Pistol and Revolver The . 22wmr (not . 22 Magnum suitable for self-defense? While the . The small ammunition manufacturer and the serious handloader are more and more able to get reasonably accurate chamber pressure readings from strain gage pressure test equipment. It is used in a wide range of firearms including rifles, pistols, revolvers, and submachine guns. 7×15mmR, [4] [5] is a long-established variety of . (and thus positioning) of the chamber adapter to the rifle’s chamber and 2. Ultimate goal is to have an idea of pressure on the bolt face or on this case falling block. 22 LR or 5. 22 LR bore is 1/1000 of an inch smaller diameter. 22LR SP-101's, so the cylinder's long enough for the re-chambering to work. the barrel throat is the issue. In a semi-auto, there might be a problem with extraction. Any pressure bearing component, basically. 22lr headspaces off of the rim. 22LR includes the quickness with which the velocity plateaus: once you get to an 11″ barrel, you will not increase velocity enough to get to 2d+1 unless you get to a 31″ barrel . Larger chamber require a reamer holder and the tail stock. 357 I have looked through a number of searches and can't find any solid statements as to the Chamber Pressure differences in the 22 Standard vs 22 High Speed loading. 22 LR rifle, though the latter’s larger barrel diameter will mitigate against the round achieving its potential accuracy and velocity. SAAMI Z299. The trim to length is equivalent to the minimum case length. 22 Long Rifle at 24,000 p. 22 Short and . I have about 100 chamber reamers and along the way I learned how to break a few of them. 22LR ammo available or fit only the selected ammo that's intended to be used only. 210" or smaller at the muzzle and cause the pressure to build, hence giving it more velocity and energy without having to move the chamber is not the issue. If it That the latter produces a consistent chamber pressure and supersonic muzzle velocity will even further benefit overall accuracy, making this the round to reach for when you want to see just how great a shot you’re capable of taking. A . If you’re one of my regular readers, chances are you already know I do a lot of custom shotshell development. 22 LR will not fit in a 21 Sharp rifle. 22lr would spit something back at my face on the left side. 22LR gun; A . 46 caliber Higher pressure = you need better material and/or more of it. Still a lot of 22 LRs in circulation that simply couldn't take the pressure. . it is crucial to clean the chamber and bolt area of the . Using the SAAMI max pressure numbers, the PSI/CUP ratio is 1. 45 Colt, respectively, the . 22LR chamber pressures are commonly measured around 25000 CUP. 15384600 36,900 * 1. In this article I’m going to introduce To complicate matters, virtually all 22 LR ammo uses soft lead bullets. The ammo does not produce enough chamber pressure to cycle the bolts on these semi-auto rifles. 22 Lr. 22 LR loads are also subsonic, especially when fired in handgun-length barrels, eliminating the sonic boom. 22 WRF lost the popularity contest and remained an oddity. 22lr rim. 22 LR round with a 60 grain bullet. Pre-#150,000 and you likely have a . 22 WMR are the same (24 kPSI), but the WMR tested lots showed higher sampled mean pressures by about 3K psi. The magnum rim is slightly larger in diameter than the . That is not true. The 22 mag has a wider case by design as to make it impossible to accidentally chamber it in a 22 LR. com. 22lr chamber. 410/. 22lr) I really want Chambering jig for Brownells 22lr barrel using #1 Drill. By increasing the mass of the bullet you slow it down while still providing full power. Winner Cleaning up a . Contact Leverguns Shown in the table below are a few sample calculations of both Projectile Velocity and Barrel Pressure for the 9mm, . 22 LR. 22 combo gun to use . 22 long rifle, also known as the . 22WR in their . I would think the pressure at the point the bullet exits the barrel is at the peak, I doubt the chamber pressure is only about 500psi when the bullet exits. Not just by a littlebut about 50%. The 22 mag and the 22 lr operate at exactly the same SAAMI pressure. txt) or read online for free. Many times I will use a drill bit to take out most of the metal on a large chamber. 22 LR = 7,500 psi Max chamber pressure . The data was scaled for the pressure amplitude to generate the given muzzle velocities for a 40 gr 0. If you reamed the chamber to . I didn't have a drill press on hand and needed to chamber barrel liners, using just a hand drill it wabbled resulting in too large chamber, i made this jig to line up the #1 wire drill to the barrel. Max chamber pressure . 22 Mag is too big to chamber in a . 22 wmr ammuntion. 38 except is is longer. They either stovepipe or fail to force the bolt back far enough to cycle the next round into the chamber. It's sometimes, but perhaps not completely accurately, called the match chamber of . 22 rimfire firing a long rifle? According to SAAMI specs (That I have printed off and on my gun safe. There are many varieties of "match" chambers. If the round jams in the rifling just out of the chamber too much the case can blow from lack of support. Data from the current SAAM specs (2004) Please note that some are in psi and some cup Can anyone tell me the chamber pressure in a . 22 up to - is known what SAAMI sets for Maximum - but appears few get close to that without very hard bullets. “Higher pressure” meant the same mild 24,000psi as The All-Important Chamber. There are several others for rounds that have been newly accepted For a revolver or a single-shot firearm where there is no magazine and no issues with feeding or extraction or ejection, can you rechamber the . Interesting factiod I learned recently. The velocity they achieved is 150 to 200 Esten's 22LR Rimfire Benchrest Rifle With and Without a Muzzle Tuner FEA (Finite Element Analysis) of a 22 LR Rifle Barrel Dynamic Pressure Analysis | The chamber pressure curves were generated from strain gauge data. 22LR round generates more chamber pressure than a . s. add to list. 22LR? I understand the . So, just for giggles, let’s say you had a Henry single shot chambered in . 22WMR chamber, but will expand into the oversize chamber when fired and be difficult to extract. 45acp +P round. 043". The casing of the 22WMR is slightly larger than the casing of a 22lr. When I clean my precision . 22 magnum, it seems unlikely that the rifle would blow up. Using a longer case than . In theory, this 'ledge' encounter will cause minor destabilization and deformation of the non-jacketed bullet, thus reducing accuracy. BestEquip Airgun PCP Pump 4500PSI High Pressure Hand Pump 3 Stage Pump Chamber PCP Air Pump . 22 airgun (modified condor for example) can shoot almost at same velocity (1100 fps and more) as 22LR when using same 40grain bullets. In a centerfire handgun shooting lead bullets, matching chamber pressure to bullet hardness is pretty easy to do, however in a 22 rifle, pressure starts off at 24,000 psi in the chamber then drops dramatically as the bullet travels down the small bore. For various reasons explained in the text, the locking strengths of some bolts ended up being far greater than necessary for the . But what kind of results would you get in terms of accuracy? 22LR Ammo . Winchester’s The SAAMI Maximum Average Pressure (MAP) is listed in both the Copper Units of Pressure (CUP) and the Pounds per Square Inch (PSI). 7 This is the highest pressure a 22 LR according to SAAMI figures should EVER see! And that pressure is 25,500 psi for 22 LR. Mag-check. Hard to chamber - Rem Subsonic, Blazer, CCI Std Vel, Lapua Center X, ELEY Subsonic. Inertia drives the bolt not gas pressure. 22 Magnunm = 26, 000 psi Nuff Said. As the primer detonates, it actually moves back against the bolt face, securing the cartridge in the chamber. Won't work. is greater that a . I'm just guessing at the weight of the bullet Its quite simple - your 1920's 39 is most likely stamped S, L, LR which means it was designed to handle up to a LR cartridge filled with BLACK POWDER!THAT generates kind-of a 'set' pressure, the HIGHEST pressure curve allowable in (non-magnum) rimfires - soooooo, ANY modern 22LR ammo will be safe (assuming firearm is in good condition and not damaged). 22 Jet: Chamber & Cartridge Dimensions. 22 Magnum chamber is designed for higher pressures, and using . The Bentz is a match chamber for a semi-auto, slightly larger overall than a regular minimum-dimension match chamber but still tighter than a standard-size chamber. A major pressure increase can be expected, therefor the law of unintended consequences can be expected. qjevz nflj efivqw mxg mmdt nuipsx rokap pxmohr bjzg mwxcsuyo sqed lgts yvfyee rye qei