 The common rifling twist rate for this cartridge is 240 mm (1 in 9.45 in), 4 grooves, Ø lands = 7.89 mm, Ø grooves = 8.20 mm, land width = 4.40 mm and the primer type is large rifle.According to the official C.I.P.rulings, the 8×60mm S can handle up to Pmax piezo pressure.