you can get what's called a CB cap.it is a 22 short lead with only about 1/3 the powder.it will kill a squirrel out to about 50'.at that distance it want go through a tin can.not alunium can,a tin can.
that way you don't have to worry bout hurting anyone.check them out.they look just like a 22 short,
so be careful and not mix them up.