Seriously, a couple of years ago I shot a buck with a slug, quartering away. He took a step as I pulled the trigger, and the round went in the ribs and out of the opposite shoulder. No blood trail at all, but I watched him run, and he was heading for the swamp. I guessed that I got more stomach than anything vital. Two of us spread out about 60 yards apart and followed the direction he was going, and there was not one drop of blood the whole way. He made it about 250-300 yards before giving in. Keep looking you will find him.