Grandpamac you forgot to mention that the 174 grain rounds caused functioning issues with the recently adopted m1 grand so back to the little 150 they went.
Ironically the longest case full power round used in shoulder arms during the war was throttled back to where a case 2/3 of the size would have produced the same ballistics and been much easier to configure a semi automatic action around.
The 300 Savage would have been a prime candidate in my opinion.
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