In my experience as a ER nurse, with human gun shot wounds, the faster rounds do way more damage. Seen many a 45 pistol people survive and have minimal hollow organ damage. Seen some shot with 223/556 and 9mm and other fast rounds. Not pretty the amount of secondary damage produced by the hydrostatic shock wave. So in trauma we say velocity is more important than mass, and so do the trauma manuals. I believe this, and the docs I work with have taken care of more than their fair share of gun shot wounds, so I tend to believe what they say about it.
