30 luger vs .32 or 380?
The 7,65x19 [Parabellum] came first...a hot round in it's day. The 7,65x17 [.32 ] and 9x17 [.380] were Browning designed rounds [whimpy low pressure] for straight blowback pistols [unlocked breech].
The low powered rounds have never been considered adequate for military purposes. [except by the Czechs with their CZ-38]
When the military wanted a bigger projectile,[1907] they [DWM] just straightened out the 7,65 case and invented the 9x19!
The Shadow Knows!
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