Our gun club has a rifle range with about 20 benches and with backers at 25, 50, 100, 200 and 300.
We don't allow shot guns on the rifle range as they tear up the backers too badly and they won't make it to the next range day.
Someone always gets silly.
So, we have a shot gun area with backers at two distances. The backers are different than the rifle range ones, they are not 2x4 frames with Coroplast screwed onto the 2x4s, they are some kinda metal sticking up about 4' -4.5' and has a orange grid/netting wrapped around it, you can take sheets of cardboard, poster paper or whatever and close pin them to the grid for sighting in and patterning.