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.Specifications:Atomic Ammunition A0045710mm Auto180 Grain Bonded Match Hollow PointBrass CasedReloadableMuzzle velocity: 1225 fpsMuzzle energy: 600 ft/lbsUses: Training, Target Shooting, and Competition20 rounds per box.