Killed many squirrels, coons, ground hogs with my 22 marauder, I use the JSB 18.13 gr. Shot groundhogs out to 52 yards with head shots and all they do is surrender by raising there tail. Squirrels are head shots under the bird feeder 38 yards out, in one side of the head and out the other, sometimes they flop around alittle but most of the time there DRT. Can't wait to see what PA is going to allow what we can use a airgun on.