Originally Posted by millwright
"CUP" dates back to the days before pizeo-electronics...
Been lots of methods of measurement of "chamber pressure" over the years. Most of the early ones were analog, and some were derivative. Of late the digital fad has predominated. Pressure can be measure directly ala the "copper crush cylinder" method with a pizeo electric crystal replacing the copper pellet and a modified chamber/cartridge. For us "realtive" types, some "blue pills" and a stain guage sufficies .>MW
Blue pills - are we talking about Viagra? This I understand.
Actually, the Sporting Arms and Ammunition Manufactures' Institute (SAMMI) established standards for arms and ammunition and does the testing. In Europe the Commission International Permanente (CIP) performs the same function.