7.65×21mm Parabellum
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The 7.65×21mm Parabellum is a pistol cartridge that was introduced in 1898 by German arms manufacturer Deutsche Waffen- und Munitionsfabriken for their new Pistol Parabellum. Wikipedia
Manufacturer: Deutsche Waffen und Munitionsfabriken
Base diameter: 9.93 mm (0.391 in)
Case capacity: 0.93 cm3 (14.4 gr H2O)
In service: 1898–1949
Maximum CUP: 28,000 CUP
Maximum pressure: 235.00 MPa (34,084 psi)
Parent case: 7.65×25mm Borchardt