Despite SAMCO's testing, to me, the issue is the state of metallurgy at the time these actions were forged. This about a 22% increase in pressure and as a consequence, case head thrust. Operating in the 60 to 62K PSI range (52K CUP or so) puts it in another catagory. Case heasd size, case body taper and other related factors lead me to believe case head thrust will be compareable between these cartridges. So this would seem to put the 7.62 X 51 in the acceptable pressure limits of the M93 action. Although this lower specification is in deference to the purportedly weaker actions of the older Mauser 93 and 95 rifles which are still in circulation, this concern is misplaced, as the original ammunition developed for, and issued with, the M93 Spanish Mauser produced an average pressure of 50,370 CUP in those rifles. By contrast, the American industry association SAAMI specifies a lower maximum pressure of 46,000 CUP or 51,000 psi. pressure to certify for sale to consumers. regulated countries every rifle cartridge combo has to be proofed at 125% of this maximum C.I.P. It's possible that confusion in nomenclature and methods of measuring pressure lead to the current pressure limit being stated as 46K PSI. CUP limit is 49K while SAAMI CUP limit is 46K. guidelines the 7×57mm case (which was the original cartridge for the M93 Mausers) can handle up to 57K psi piezo pressure whereas SAAMI lists the limit at 51K PSI. The small ring actions are still good actions, they just don't have the additional, beefed up design features to handle gas escaping from a pierced primer.Īccording to the official C.I.P. It is said that the losing an eye lead to eventual developement of the large ring M98 Mausers. That said, Paul Mauser lost an eye developing his actions with it's inherent safety features. Here's an interesting article about the M1916 Mausers:
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