Cartridge Dimensions
The 8mm Remington Magnum has 6.43 ml (99 grain) H2O cartridge case capacity.
8mm Remington Magnum maximum C.I.P. cartridge dimensions. All sizes in millimetres (mm).
Americans would define the shoulder angle at alpha/2 = 25 degrees. The common rifling twist rate for this cartridge is 254 mm (1 in 10 in), 6 grooves, Ø lands = 8.00 mm, Ø grooves = 8.20 mm, land width = 3.10 mm and the primer type is large rifle magnum.
According to the official C.I.P. (Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives) guidelines the 8mm Remington Magnum case can handle up to 460 MPa (66717 psi) piezo pressure. This is a very high maximum chamber pressure limit for a rifle cartridge and ≈ 2.6% above the SAAMI maximum piezo pressure rating of 448 MPa (65000 psi). In C.I.P. regulated countries every rifle cartridge combo has to be proofed at 125% of this maximum C.I.P. pressure to certify for sale to consumers.
The German 8 x 68 S cartridge introduced in 1939 is probably the closest ballistic twin of the 8 mm Remington Magnum. The 8 x 68 S is however a rebated rim cartridge.
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