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I am in a heated discussion with a few fellow handloaders that insist that the 7.62 NATO has a MAP of 50,000 psi.
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The problem is that the US Army is not a member of SAAMI or CIP and for a good number of years specified ammunition on the basis of a crusher gauge calibrated in pounds per square inch, dead load or hydraulic.
They ignored the CUP term coined by SAAMI to distinguish between crusher gauge and piezoelectric transducer readings for a long time. This has led to the common myth that commercial .308 is loaded substantially "hotter" than military 7.62 because the units were given as "psi" for both, although measured differently.