You might want to request the police bring a k9 unit out to check your property. That guy might have a grow going on your land. Sometimes those guys will pop off a few rounds when they enter their crop zone. If police are waiting on him, the shots will usually bring them out and he will tell them he was hunting. They also think the shooting will run off anyone raiding their crop. Usually they're wrong about the last one. Don't go searching by yourself, they like to booby trap the perimeter.