 This means that 8×68mm S chambered arms in C.I.P.regulated countries are currently (2014) proof tested at PE piezo pressure.The American .325 WSM cartridge introduced in 2005 is probably the closest ballistic twin of the 8×68mm S. The .325 WSM is considerably shorter and fatter and has a more radical rebated rim (P1 -R 1 = 0.51 mm), much steeper shoulder angle (70 degrees / 35 degrees for Americans) and a shorter neck (7.82 mm).