At every range I've been to, and every club I've belonged to (three now), there are strict rules against shooting at anything but paper targets mounted on the target frames. Shooting fruit, soda cans, charcoal, clay pidgeons, etc. on the ground or even up against the berm will get you escorted permanently off the range if you get caught.
There are good reasons for such rules. Shooting at objects on the ground in front of the berm will definitely lead to ricochets going over the berm. Putting an object up against the berm is probably safe, but most people won't understand why putting it 20 yards in front of the berm is not also safe, so it's best not to open that door at all.
My point is you need to think about what kind of example you set by allowing such "fun" at your range. You wouldn't want to encourage people to be rule-breakers. I'm not saying don't do it, but explain that such shooting is only allowed under controlled conditions, etc.
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