USA centerfire rifle ammo is the ideal choice for training or extended sessions at the range and provides several features such as no expansion, positive functioning, good accuracy, and no barrel leading. Brand Winchester Ammo Category Centerfire Rifle Rounds Series M855 Green Tip Model USA Caliber 5.56x45mm NATO Rounds Per Box 150 Casing Material Brass Muzzle Energy 1289 ft lbs Muzzle Velocity 3060 fps Application Target Boxes Per Case 4 Bullet Type Full Metal Jacket (FMJ) Bullet Weight 62 gr Similar Items A223 Search Code WRFL