I am using a .30-06. I was aiming at the vitals, but based on the blood trail and the small piece of meat I don' t think I hit vitals. I still don' t know what that original gelatin type stuff was; it sure looked like heart or lung. I have heard that watery blood means a marginal hit. I checked my gun when I got home and it was 2 inches low at 100 yards, I still should have hit the boilerroom. To me, the whole key is the watery blood, what would cause that?