Aguila 5.56 55 Grain FMJBT 300 Rnd Box This popular and proven varmint hunting and target-shooting round delivers exceptional accuracy at an affordable price. A 55-grain projectile quickly takes out medium-sized game. Caliber: 5.56 NATO Bullet Type: Full Metal Jacket Boat Tail Bullet Weight: 55 GR Muzzle Energy: 1298 ft lbs Muzzle Velocity: 3260 fps Rounds Per Box: 300 Boxes Per Case: 8 Application: Target, Range or Hunting Casing Material: Brass