This is .338 Lapua Magnum Lapua 250gr Full Metal Jacket Boat Tail Lock Base Ammo. Lapua ammunition is world renowned for accuracy and performance, making use of high quality components and adhering to the strictest of tolerances. The .338 caliber Full Metal Jacket Boat Tail bullet delivers a flat and low drift trajectory even in the strongest cross wind. This ammunition is new production, non-corrosive, in boxer primed, reloadable brass cases. The muzzle velocity is 2952fps and the energy is 4840ft-lbs. This ammo comes packed in 10rd. boxes.