I use both depending on distance & angle. I'm always shooting a heavy for caliber cast bullet so I always get pass through's except for a couple of HP's in the last 4-5 years. Even then most of them are pass through's.
Shoulders on deer don't offer much resistance to a quality bullet of any kind. If I were guessing I'd say that too much speed might be the cause of most bullet failures. Just a guess.

Dick