Bullet Ballistics: CUP NB that the SAAMI spec chamber pressure for the .22LR and .22 WMR are the same (24 kPSI), but the WMR tested lots showed higher sampled mean pressures by about 3K psi. It is a super cheap way to make chamber and you roll the dice on accuracy and leading can be a problem with oversize throat couple that with a .224 bore which is for 22 mag bore and not a .2225 bore for 22 lrs that why you will get fliers and a good chance of leading . Probable result of a .22LR in a .22WMR chamber will be case splitting and gas excursion out of the chamber. After 10-12 hours, eject the 7.62x39 case and you are ready to start shooting. These pressures are higher than many of the older (and some fairly new) centerfire rounds. The document even includes info on pressure terminology, headspace gauges, and test barrels. Simply coat the the outside of the adapter with non permanent Locktite™, place a fired 7.62x39 case inside the chamber and close the bolt. This pressure is measured in “copper units of pressure” (CUPS) and expressed in thousand of pounds per square inch (PSI). The Pressure value used for each caliber happens to be the maximum SAAMI safe chamber pressure. SAAMI MAP for 22 Short, 22 Long, 22 Long Rifle, 22 Magnum and 17M2 is 24,000 PSI as measured by the piezoelectric method. Hard to chamber - Rem Subsonic, Blazer, CCI Std Vel, Lapua Center X, ELEY Subsonic. 17HMR SAAMI MAP (max average pressure) is 27,000 PSI. The Ruger SA cylinder is bored straight through with a drill bit and not chamber with a chamber reamer . The heavier the powder charge, the greater the PSI. Easy to chamber - Win 333 Bulk, Fed Value Pack, Wolf MT & ME, CCI Mini Mag, ELEY Match EPS, ELEY Match Extra. DOWNLOAD SAAMI Rimfire Cartridge/Chamber Drawings >> SAAMI , the Sporting Arms and Ammunition Manufacturers’ Institute, is an association of the nation’s leading manufacturers of firearms, ammunition and components. Naturally, the purpose of generating pressure in the cartridge case is to force the bullet out of the case mouth and on down the barrel. Also, the moving piston must be brought to a halt, which skews a reading in the opposite direction. Loose Þ bullets that are physically seated loose in the case.. On to the 2004 shooting tests at H-S Precision. About Leverguns. .22 Hornet . ** = less than 1 percent of the measured ammunition. I can chamber the "hard stuff" but the additional pressure required to close the bolt makes it a HUGE aggravation. The shooting tests were conducted in one of H-S Precision’s climate controlled shooting tunnels. Pounded by high pressures, crushers don’t register peak pressure accurately because the flow of copper is slower than the change of pressure in the chamber. 43,000 cup .300 Win Mag . Lead is a soft metal. 64,000.218 Bee: 40,000 cup.303 British ... SAAMI Pistol Pressure Specifications (Maximum Average pressure) All Piezo measurements unless specified) ... Chamber & Cartridge Dimensions. H-S Precision supplied a new 22-caliber ballistic test barrel that is 2 inches in diameter, and 22 inches long. As you can see, the calculated results are pretty accurate and closely reflect values you would expect. In a semi-auto, there might be a problem with extraction. Inexpensive Russian ammo costs 25-50% less than any regular 308 or 30-06. The maximum chamber pressure for the .22 Long Rifle cartridge is only 24,000 psi, so the strongest of actions is not required for containing it during firing. Current Levergun Makers. Thousand of pounds per square inch ( PSI ) maximum SAAMI safe chamber.... Brought to a halt, which skews a reading in the case.. on to the 2004 shooting tests conducted! With extraction a chamber reamer ) centerfire rounds any regular 308 or 30-06 powder! Many of the measured ammunition info on pressure terminology, headspace gauges, test. 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