During this deer season I saw heart-lung damage that seems impossible for the bullet itself to accomplish. I have a theory that is not yet well thought out that much of the damage might have been done by air compressed in the nose of the bullet and released as expansion began. Am I completely out of left field? Of course, I do not have any idea the pressure the air is compressed to or the volume of air contained at whatever pressure is there. But.....A truck tire exploading somewhere before reaching 110 psi kills the maintance man. A SCUBA cylinder exploding somewhere before 3000 psi destroys a dive shop.