It uses the .50 BMG case with the neck opened up to accept a .585 in (14.9 mm) bullet. It fires the 1,173-grain (76.0 g) bullet at 2,700 ft/s (820 m/s) with the fire-formed load. The Barnes 750-grain (49 g) bullet can also be loaded to 3,000 ft/s (910 m/s). It has a destructive device exemption. Only rifles chambered for the .50 BMG can be converted to this caliber.