Ammunition Specifications Caliber: 223 Remington Bullet Weight: 69 Grain Bullet Type: Sierra MatchKing BTHP Muzzle Velocity: 2950 Quantity: 20 rounds per box These heralded loads combine the legendary Sierra MatchKing Boat-tail bullet with Federal s proprietary delivery system. Stringent manufacturing controls give you what many experts and international shooters consider the most accurate match round available from a factory. World-class competitors, as well as military and law enforcement officials, choose Gold Medal when it counts the most.