Hornady 5.56 NATO 55 Grain GMX ammunition utilizes advanced progressive propellants to deliver high performance and accuracy. Designed for both protection and performance, this lead-free ammo achieves a muzzle velocity of 3130 fps and a muzzle energy of 1196 ft lbs. Each box contains 20 rounds, making it ideal for training sessions and range use. The GMX bullet ensures reliable expansion and penetration, while the brass casing provides durability and consistent performance in various firearms including semi-autos and pump actions. Perfect for responsible gun owners looking for high-quality ammunition for their 5.56 caliber rifles.