9×18mm Makarov maximum C.I.P. cartridge dimensions. All sizes in millimeters (mm).The common rifling twist rate for this cartridge is 1 in 240 mm (9.45 in), 4 grooves, ø lands = 9.00 mm, ø grooves = 9.27 mm, land width = 4.50 mm and the primer type is...
