Muzzle Energy is the kinetic energy of a bullet as it is expelled from the muzzle of a firearm and is used as a rough indication of the destructive potential of a given cartridge. This is especially useful for hunters, as you generally want our bullets to impact the animal at 1850fps to achieve full hyrdostatic shock. For best results, use our ballistics calculator to determine what the energy of the projectile will be at various ranges.