I have been hit a number of times by variuos materials coming back from the targets. I like to shoot interesting things I find in the blm land. one time it was with a .30-06, hit me square in the chest, knocked the wind out of me, bruised, bled but didn't really penetrate cause the round was already flattened.
I've been hit dozens of times by shotgun pellets, car parts, plastic and glass, but I don't really count that unless it draws blood.
Once had a .22lr round bounce off of my leather hat, and that time I didn't even have a gun in my hand.
Worst one was actually a piece of wood stuck in my bicept while shooting shotguns.
Never too bad, but I always use eye protection, and when doing that kind of shooting I wear heavy clothing.