I have a 6 acre hill country lot on a hill and it's legal to shoot, but no natural backstop. So I made one. Set out to 25 yds most of my shooting will be handgun and 22 rifle.
Here are some pics of my bullet trap and thought I'd share them with anyone who might have a similar situation. It starts as an 8' x 2' galvanized stock tank. Cut in half then bolted together to make a rain proof container (to keep the sand dry) and a slide-in 4x8 sheet of asphalt board to staple targets to. The 3' x 4' x 1/4" steel plate is back-up for bullets that might actually go through the sand (unlikely).