Anyway, to the bullet question. As you have noticed the fragmentation is one thing but the bullet speed which makes the bullet give more energy to destroy nearby soft tissues and even hard tissues (bone). The bullet is not the only problem. As many war films claim. Take the bullet away, which of course is necessary, but if the local soft tissues are damaged you cannot do a thing with the limb for a long time.If ever. The pressure from the bullet simply destroys the muscles etc to useless tissue. The faster the bullet, the more energy is released to the tissues.