Easier to make sure the shooting position forbids shooting outside of the range. I.E., shoot through a 4' piece of concrete conduit so that no matter what, your rounds go directly to the berm. Make the berm out of something solid. Tires filled with dirt, or road plate (3/4" steel) angled downward. That way, no risk of stray rounds. Do that, and you're pretty safe and won't ever have issues where someone can claim you shot into their property. Which is, btw, about the only way someone can keep you from shooting on yours.
You could also do what I did, which is to buy a shooting shed (std. garden shed). Then, you have a covered position, something to keep you shooting in 1 direction, and some baffling to keep you a tad quieter. Works like a charm, and best of all it doubles as a....you guessed it....storage shed.
Cheers.