At at arms length/ when the victim is close enough to grab the end of the barrel (for whatever reason) shotgun loads will punch clean through and leave a mess on the other side. The single most horrible scene I worked was a triple. A double murder, then suicide and the guy used goose loads. I am not going to go into details because even now I don't want to think about that one as it involved a young person, and it was like something out of a horror movie.
Shotguns in tight quarters are just devastating.