Originally Posted by mathman
Quote
.270 Winchesters and similar cartridges of that era were less than 55,000 PSI and more likely 52,000 PSI


Despite the erroneous use of PSI in much of the literature, when 52,000 is mentioned as the limit for the 270 it's CUP. That translates to about 61,000 PSI.


I checked SAAMI and it does list the 270 at 65,000 PSI, I guess I was assuming a 30-06 case and it is rated lower, but only by 5,000 PSI, at 60,000

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