The .50 Peacekeeper is a wildcat rifle cartridge that was designed by J.D. Jones of SSK Industries. It uses a .460 Weatherby Magnum case that has been re-sized to accept a in ( mm) diameter bullet. The .50 Peacekeeper is usually loaded with bullets that weigh in the range of , and with muzzle velocities that range from . A gr ( g) bullet fired at ft/s ( m/s) carries roughly ft·lbf ( J) of energy. Recoil in a rifle is slightly less than that of a lb ( kg) rifle chambered in .50 BMG.