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If I launch my .355" bullet at the same velocity regardless of cartridge case, should I simply choose the cartridge case that allows me the most rds in the magazine?
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You are talking the difference in 364 FPE +/- VS 600 FPE +/- That is quite significant considering the bullets are almost identical weight, though the design differs allowing for performance at the higher velocity. If you cannot solve the problem with 14 rounds of 357 then 16 rounds of 9mm are not the answer. What you are doing is called rationalization, it is an informal fallacy of reasoning.