Range & Target 5.56x45 FMJ 55 Grain Engineered for precision and consistency, Norma 5.56x45mm 55 grain Full Metal Jacket ammunition is built to perform. Whether you&';re training at the range or stocking up, this cartridge delivers dependable accuracy, clean-burning powder, and reliable cycling in both AR-platform and bolt-action rifles. Specifications Bullet Type FMJ Case Type Brass Grains 55 Muzzle Energy 1211 Muzzle Velocity 3150 Number of Rounds 20