My opinion. Go out and shoot, it seems that you have taken as many precautions as possible. If some one were to complain, (very unlikely) and the police did show up (less likely) I'm sure they would just ask you to stop (worst case) assuming guns/ people using guns were all legal. I have a range in my back yard and the only thing that has ever happened was a neighbor (1/4 mile away) has called to see if I was shooting one day when I had like 8 friends over (it did sound like a small war going on). That was it.