Thank you all for you input, I think the empty paper box will work for me, with rubber mulch and maybe a pillow
. I use to use phone books but the more you shoot them up they start to swell and bust out the box or at least bow it out. I will just keep applying duck tape to the front to front of the box lid as i punch holes in it. Maybe cover the outside of the box with a plastic tarp or trash bag so the weather doesn't tear it up.
I have the .22 champion bullet trap but it pings really loud early in the morning.
I like the bucket idea as well instead of the box, for weather proofing anyway.
I've stopped by home depot but never saw a hunk of wood that was 6" thick and 12"x12" would work for me too.
I stuffed a pair of jeans in a post office box and that has worked for a while but I had a go thur recently so don't know if its time to change the box or get some more jeans.
The rubber ballistic is pricey and it says 600 FPS wadcutter can penetrate it so 900 FPS 18.10 JSB will surely go thru at least one sheet.
Thanks again for all the ideas, feel free to post pictures if you like. Nothing says sexy like a well constructed airgun backstop or 75 yard head shoot on a ground squirrel thru a scope cam................other than a half naked woman doing just a bout anything that is.