 Ø lands = 9.00 mm, Ø grooves = 9.28 mm, land width = 4.60 mm, 4 grooves, the common rifling twist rate for this cartridge is 360 mm (1-14.17 in), and the primer type is large rifle magnum.According to the official Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives (C.I.P.