Shotguns are for the birds.
Ya ever seen what a 12 gauge 1 oz slug does to flesh? There is a reason people use 12 gauge slugs as defense against brown or grizzly bears....and not 5.56 rounds or AR-15s.
Humans DO NOT survive hits with 12 ga slugs to the torso. .80 cal holes in and out minimum with zero expansion. More likely to expand to 1". It isn't pretty at all.