Cartridge Dimensions
The 7.65×21mm Parabellum has 0.93 ml (14.3 grains H2O) cartridge case capacity.
7.65×21mm Parabellum maximum C.I.P. cartridge dimensions. All sizes in millimeters (mm).
The common rifling twist rate for this cartridge is 275 mm (1 in 10.83 in), 4 grooves, ø lands = 7.62 mm, ø grooves = 7.83 mm, land width = 3.05 mm and the primer type is small pistol. This cartridge headspaces on the shoulder of the case.
According to the official C.I.P. (Commission Internationale Permanente Pour L'Epreuve Des Armes A Feu Portatives) guidelines the 7.65×21mm Parabellum case can handle up to 235 MPa (34,100 psi) piezo pressure. In C.I.P. regulated countries every pistol cartridge combo has to be proofed at 130% of this maximum C.I.P. pressure to certify for sale to consumers.
Read more about this topic: 7.65 X 22 Mm Parabellum
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