I'll throw my 2cents in. Jim Watson has the parentage fairly correct as I have come to understand it. The Borchardt was the beginning and essentially Mauser 'perfected' the round. Luger did not want a Mauser round in his redesign of the Borchardt pistol and shortened the cartridge to 21mm and the .30 Luger was born. The Russians loved broomhandles and the 7.63 X 25 came along with it. They 'borrowed' Browning's design for Tokarev T30/33 and the rest is history.
Common advice is to not use ammo loaded for the Tokarev [or a SMG] in a broomhandle, as Tok loads are often a bit hotter than .30 Mauser. Considering the youngest broom is nearly a hundred years old, I'm not taking the chance with mine and only shoot very light handloads. I do have a Tokagypt 58 with the appropriate barrel and shoot most any 7.62/3X25 ammo available. It also has the 9mm barrel. Look up 'Manowar's Hungarian Weapons and History' for more on the Tokagypts.
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