There are few weapons (aside from shotguns and large game hunting rifles) which have been built that fire projectiles between .50 caliber (, roughly 13 mm caliber) and 20 mm caliber, though the 14.5 mm caliber is used by some Soviet machineguns such as the KPV and antitank rifles such as PTRS, PTRD, and NTW-20. A very small number of anti-tank rifles have been produced in 20 mm and larger calibers. As an example, the 20x102 has a 100 gram bullet fired at a muzzle velocity of . For a simple slug round this is a muzzle energy of .