this is what i use
i took a old p,c montor an guted it
sprayed about 3in of foam in the back
with the light stuff i just hang a can
an when i shoot full power with heaver
shot i hang a old beech towel in side
the towel will stop the hardest hitting
stuff i sling at it you can cut
card board for a paper target backing
tape across the face or take the outer
rim off an place between the back an frame
been shooting at it all summer holding up
very well!!!
this is the little david with a ray shot
pouch i shoot this most times in doors
177,cal b,b up to the 6mm is as heavy
as i go with these bands
hope this helps