We used to do it when I was younger using a 10/22 (sometimes, with low power scopes) and a wobble trap. We would shoot "down" onto the targets from a hill, so the bullets would strike into the dirt. The bullets were not shot into a dangerous, upward direction, but always into some type of back stop (dirt). Amazingly, after a few clips, it was not too difficult to hit a few out of every 10-15 shots.