bullet that penetrates deeply, which can be achieved with a larger, slower non-expanding bullet, or a smaller, faster expanding bullet such as a hollow point. In the extreme, a heavier bullet (which preserves momentum greater than a lighter bullet of the same caliber) may "overpenetrate", passing completely through the target without expending all of its kinetic energy. So-called "overpenetration" is not an important consideration when it comes to wounding incapacitation or "stopping power" because: (a) while a lower proportion of the bullet's energy is transferred to the target, a higher absolute amount of energy is shed than in partial penetration, and (b) overpenetration creates an exit wound. Other contributing factors As mentioned earlier, there are many factors, such as drug and alcohol levels within the body, body mass index, mental illness, motivation levels, and gunshot location on the body which may determine which round will kill or at least catastrophically affect a target during any given situation. See also Table of handgun and rifle cartridges Taylor knock-out factor References Notes External links What We Didn't Know Hurt Us (PDF) One Shot Drops – Surviving the Myth Ballistics