Distinguishing Between 9 mm and 7.65 mm Parabellum on the Fly
Gentlemen,
IMO the simplest method is to try an insert a round of .32 ACP ammunition into the muzzle of the Luger.
If the Luger has a 9x19 mm barrel the .32 ACP cartridge will slip into the barrel right up to the semi-rim on the cartridge casing.
If the Luger has a 7.65 mm barrel the .32 ACP cartridge will stop before the case mouth enters the bore.
Best,
Kyrie
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