This is .458 Win. Magnum 500gr. DGX (Dangerous Game eXpanding) Superformance Ammo. DGX bullets are made with a hard lead/antimony alloy cone, surrounded by a copper clad steel jacket. These bullets feature a flat meplat for straighter penetration and create more energy transfer than a simple round profile bullet. Hornady Dangerous Game Series ammunition is designed specifically for large game and safari hunting. Muzzle velocity 2140fps. This ammo comes packed 20rds. per box.