Also - I'm not familiar on the particular subject of ww2-ammunition, but there are examples of "hotter" ammunition of a given caliber being supplied to submachineguns and machinepistols, whereas pistols would use lighter loads. Sweden's 9mm 9B for the m/45 is one example. Purpose made for the submachinegun, would chew up all contemporary sidearms, and a fair share of modern ones as well.
That
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