Atomic Ammunition .357 MAG 158 Grain BJHP 50 Round Box Features: Atomic ammunition knows that in the real world we shoot using real guns not test barrels in a laboratory. This is why Atomic is committed to providing you real world data instead of misleading info from test barrels. All of the external ballistic information that is obtained is done so using common firearm that you either own or use. This is the most accurate and useful information on the market. Next time you are in need of some defensive ammo give Atomic ammo a try you won t regret it. Atomic Ammunition .357 MAG 158 Grain BJHP 50 Round Box Specifications: .357 Magnum 158 Grain Bonded Jacketed Grade Hollow Point Nickel Plated Brass Cased Reloadable Muzzle velocity: 1350 fps Muzzle energy: 640 ft/lbs Velocity/Energy based on 4 barrel Muzzle velocity: 1225 fps Muzzle energy: 525 ft/lbs Velocity/Energy based on 2-1/8 barrel Uses: Self Defense or Personal Protection