This ammunition is new production, non-corrosive, in boxer primed, reloadable brass cases. This ammo is for cartridge size 450 Bushmaster. The bullet is made from Lead. The diameter (caliber) of this bullet is 0.452. This bullet weighs 360 grains. This bullet leaves the barrel at 1750 feet per second. The ammo case is made from Nickel Plated Brass. This ammo is a proven round for hunting. The bullet in this product does contain lead. This round is designed to be supersonic and travels faster than the speed of sound. The muzzle energy of this ammo is 2449 ft lbs. This product has been designed to be an effective choice for the ultimate in self-defense applications. This ammo IS SAFE to use in a suppressor. Each box of ammo contains 20 loaded pieces of ammunition. This ammo is manufactured by Underwood Ammo