This pressure is measured in “copper units of pressure” (CUPS) and expressed in thousand of pounds per square inch (PSI). About Leverguns. Lead is a soft metal. .22 Hornet . 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. In a semi-auto, there might be a problem with extraction. ** = less than 1 percent of the measured ammunition. The shooting tests were conducted in one of H-S Precision’s climate controlled shooting tunnels. The Ruger SA cylinder is bored straight through with a drill bit and not chamber with a chamber reamer . SAAMI MAP for 22 Short, 22 Long, 22 Long Rifle, 22 Magnum and 17M2 is 24,000 PSI as measured by the piezoelectric method. 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. Hard to chamber - Rem Subsonic, Blazer, CCI Std Vel, Lapua Center X, ELEY Subsonic. 64,000.218 Bee: 40,000 cup.303 British ... SAAMI Pistol Pressure Specifications (Maximum Average pressure) All Piezo measurements unless specified) ... Chamber & Cartridge Dimensions. Also, the moving piston must be brought to a halt, which skews a reading in the opposite direction. Easy to chamber - Win 333 Bulk, Fed Value Pack, Wolf MT & ME, CCI Mini Mag, ELEY Match EPS, ELEY Match Extra. The document even includes info on pressure terminology, headspace gauges, and test barrels. 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. These pressures are higher than many of the older (and some fairly new) centerfire rounds. 43,000 cup .300 Win Mag . H-S Precision supplied a new 22-caliber ballistic test barrel that is 2 inches in diameter, and 22 inches long. I can chamber the "hard stuff" but the additional pressure required to close the bolt makes it a HUGE aggravation. The heavier the powder charge, the greater the PSI. Inexpensive Russian ammo costs 25-50% less than any regular 308 or 30-06. After 10-12 hours, eject the 7.62x39 case and you are ready to start shooting. 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. 17HMR SAAMI MAP (max average pressure) is 27,000 PSI. The Pressure value used for each caliber happens to be the maximum SAAMI safe chamber pressure. Bullet Ballistics: CUP Probable result of a .22LR in a .22WMR chamber will be case splitting and gas excursion out of the chamber. Loose Þ bullets that are physically seated loose in the case.. On to the 2004 shooting tests at H-S Precision. 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