When I was in the Army we shot on an old range one day. Platoon Sargent made sure everyone worked behind the bern raising and lowering the target and marking and patching. You heard the rounds cracking going over head but the actual reports of the M16's was a hard to hear popping in the distance. He said that's what it sounded like being shot at. Not like on TV.
In the past week or ten days they've driven by your house several times where they'd not done it much before. I think you're already on their radar. You might ask the property owners if these people had permission to be on the property hunting or shooting. How big is the property, a city lot or acreage?
Oh wow. Never mind me.