8mm Remington Magnum - Cartridge Dimensions

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.