Nosler Trophy Grade Ammo. A sure Shot! Manufactured to Nosler's strictest quality standards to attain optimum performance no matter where your hunting trip takes you. Nosler Trophy Grade Ammunition has the right load for the right game!Cartridge: 257 Robert + P AmmoBullet Wt. Grains: 110Bullet Style: ABMuzzle Velocity (F.P.S.): 3,000Muzzle Energy (Ft.-lbs.): 2,198Rounds per box: 20.