.22 cal “rat shot”
http://www.cabelas.com/rifle-ammunition-federal-22-rimfire-ammunition.shtml
Wouldn’t even really sting the guy who got hit.
Follow the money.
I don’t know I worked with two guys one thought it would be real funny to shoot his friend with some 22 rat shot out of a rifle, I only saw the results about a week later and it left some pretty bad looking holes in his back not red spots they were holes and believe it or not they are no longer friends!