Get a cardboard box and lay WET newspaper in it til
its full, tip it on its side and you have a great target.
A 22 wont go thru it, but if you are gonna shoot somnething
with more power just put a stack of firewood or something behind
it. I do this with my .50 cal muzzleloader, very few bullets
go all the way thru but Ive found that if I put a phonebook
or two in there it stops em all. Great way to recover bullets
and see how each one performs also.