Winchester USA 5.56x45mm NATO 55 Grain Full Metal Jacket Centerfire Rifle Ammo 125 Rounds. The easily identifiable white box means high quality and reliability at a low price. This ammunition is loaded with a full metal jacket bullet which is known for its positive functioning and exceptional accuracy. On impact this bullet does not expand and is ideal for target shooting. This ammunition is new production non-corrosive in boxer primed reloadable brass cases. Specifications for Winchester USA 5.56x45mm NATO 55 Grain Full Metal Jacket Centerfire Rifle Ammunition: Manufacturer: Winchester Caliber: 5.56x45mm NATO Number of Rounds: 125 Bullet Type: Full Metal Jacket (FMJ) Bullet Weight: 55 grain Cartridge Case Material: Brass Muzzle Velocity: 3270 ft/s Muzzle Energy: 1235 ft-lbs Application: Target Package Type: Box Primer Style: Centerfire Lead Free: No Package Contents: Winchester USA 5.56x45mm NATO 55 Grain Full Metal Jacket Centerfire Rifle Ammunition What is Winchester USA 5.56x45mm NATO 55 Grain Full Metal Jacket Centerfire Rifle Ammunition good for? The manufacturer says that it is best for target.Winchester USA193125: USA 5.56x45mm NATO 55 Grain Full Metal Jacket Centerfire Rifle Ammo 125 Rounds