Ballistic gel well illustrates the effects of hydraulic shock or temporary wound channel. It's much more prevelant at the begining of the wound channel and declines dramatically as the bullet slows. At that point it's all about the hole. It becomes apparent that velocity and the size of the temporary wound channel share a close relationship so it's pretty easy to make the case that a bullet that retains velocity/energy and passes through actually has a longer track of hydraulic shock and creates more secondary damage to tissue. It's also very obvious that engery dump is a myth. The bullet slows because of friction and loses energy because it loses velocity....not because it's transfering or dumping it.