The Winchester USA M855 5.56 ammunition features 62 grain, full metal jacket projectile capable of traveling 3020 feet per second giving it 1255 foot pounds of muzzle energy designed for training and plinking. This load features non-corrosive reloadable brass casing to improve feed reliability and prevent damage to the firearm's chamber. The full metal jacket consists of a soft core, encased in a harder metal shell to maintain their composure and trajectory for greater penetration and less expansion.