Several years ago, I shot at a nice buck right behind the shoulder at 200 yds with my usual 300 H&H mag load with 180grain Ballistic tips. I have killed many deer with this same load - mostly bang flops and the one that wasn't had a massive blood trail. The deer trotted off with his tail tucked. I waited an hour only to find no hint of a hit - no blood, no hair - nothing. A while later I started the circle search pattern and found him only about 30 yds away from where he stood. He only had a few drops of blood dripping from his nose. When I skinned him, the bullet had center punched a rib going in but did not exit. Lungs were a mess. I heard a thump in the gut bucket but never found the bullet. This is the only time I haven't had an exit with that load.