RANGE DYNAMIC 5.56X45 NATO M193 RIFLE AMMO Fiocchi Range Dynamics ammunition offers the American shooter cost-effective options that utilize the finest components available. High-volume shooters appreciate this, and they strive in their craft by never compromising any quality standards with options that will suit the shooters needs. SPECS Caliber: 5.56 NATO Bullet Type: Full Metal Jacket, Boat Tail (FMJBT) Bullet Weight: 55 Grains Rounds: 50 Rounds per Box or 1000 Rounds per Case Muzzle Velocity: 3240 FPS Muzzle Energy: 1280 ft\lbs. Bullet Diameter: 0.224" Jacket Material: Copper Core Material: Lead Casing: Brass Mfg: Fiocchi Ammunition