Nosler Custom Trophy Grade has the strictest quality standards ever. Nosler Custom brass and Nosler bullets. Cases checked for correct length. Necks sized chamfered and trued. Flash holes inspected for correct alignment. Whether you want your ammunition loaded with AccuBond Partition Ballistic Tip or E-Tip Nosler Custom Trophy Grade Ammunition will have the right load for the right game. – Caliber: 257 Roberts – Bullet Type: AccuBond – Bullet Weight: 110 gr – Muzzle Velocity: 3000 fps – Muzzle Energy: 2197 ft / lbs – Rounds Per Box: 20