From here: Petzal: A Cautionary Hematoma Tale | Field & Stream
The pic says it all. I've never even gotten an actual bruise from a 12 ga., but stuff like this takes all the fun out of it for me. I have taken a lot of crap from male relatives on my preference of a 20 ga., but seriously, while I'll shoot a 12 ga. if I have to, I'm not voluntarily training with one. Same goes for any long gun with a big kick.