Description XM855 ammunition is loaded to NATO specifications. It is not intended for use in commercial bolt-action rifles chambered in 223 Remington. The full metal jacket bullets feature a steel core and green penetrating tip. Brass cases are reloadable. **Please Note: While the 5.56x45mm will fit in a .223 Remington chamber, the 5.56 is a military round that runs at higher pressures than its .223 counterpart and is not recommended to be fired in a .223 Remington Chamber. PRODUCT DETAILS:Cartridge: 5.56 Nato Grain Weight: 62 Grains Muzzle Velocity: 3100 Feet Per Second Muzzle Energy: 1323 Foot Pounds Bullet Style: Penetrator Full Metal Jacket Lead Free: No Case Type: Brass Primer: Boxer Corrosive: No Firearms, trailers, and some accessories are only available for purchase in stores. Each location follows all BATF and individual state/county/city laws to insure the desired product is legal for sale. Any info provided online is subject to change, please go to your local store for more accurate information.