yeah sabot is dead on......i remember reading some of peter capsticks books on guiding in africa (great books by the way), and he talks of shooting cape buffs and rhinos in the heart and the animal still had enough steam to charge and cause all kinds of mayhem....i think something like a brain shot or something shocking the spinal cord is the only way to truly drop an animal in its tracks.....heart and lung shots the animal can still cover some distance.