Best homemade backstops....

[LRRPF52]

With SuperAdobe, you can make curved semi-domes with multiple layers, using shredded tires mixed with the sand. That shape would provide the best control of ricochets, which can't be accounted for once they hit the ground unless a large backstop is in-place. The sandbags are tubular on a cable spool, and used like long bricks, not small bricks. You use barbed wire between them to act as a mortar, since tons of weight compresses them down on each other, locking them together to a point where they are stronger than standard reenforced concrete with rebar of the same thickness, and you only need 10% cement mixed with 85% sand, with 5% water or a water-acrylic blend if you prefer the modern synthetic bonding agents for more durable cement.

You do have to cover the bags to prevent UV deterioration though.