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Jim Watson · November 29, 2008, 01:48 PM

How about a third number? Accurate Arms says the SAAMI maximum average chamber pressure for .38 S&W is 13,000 CUP. It may be that 17,000 is the absolute maximum individual pressure reading. Those things are not as accurate as they would have us think.

The British axial crusher system is significantly different to US radial crusher or anybody's transducer. Gough Thomas compared all available shotgun loads and reload data and concluded that a British ton per square inch was equivalent to about 2800 US LUP in that application. Rifles and pistols, who knows? I don't know if the British are using CIP now or if they still follow their own system.

November 29, 2008, 01:48 PM	#15
Jim Watson Senior Member Join Date: October 25, 2001 Location: Alabama Posts: 18,543	How about a third number? Accurate Arms says the SAAMI maximum average chamber pressure for .38 S&W is 13,000 CUP. It may be that 17,000 is the absolute maximum individual pressure reading. Those things are not as accurate as they would have us think. The British axial crusher system is significantly different to US radial crusher or anybody's transducer. Gough Thomas compared all available shotgun loads and reload data and concluded that a British ton per square inch was equivalent to about 2800 US LUP in that application. Rifles and pistols, who knows? I don't know if the British are using CIP now or if they still follow their own system. Last edited by Jim Watson; November 29, 2008 at 01:55 PM.