Just an update, there is a new berm built at the base of the hillside, there are new target stands built, much nicer than the old single stand I had. There is a fresh case of Tannerite in my ammo cabinet. I'm planning to initiate the new range on Saturday morning . . . but I will be nice and wait until 10am.
It might be helpful if you show your neighbor your setup. Explain to him that it couldn't hit his house even if you fired over the berm. The trajectory just doesn't work that way.
Showing him that you have setup your range in the same way that the state sets up public ranges may help reassure him.
My neighbor kid will shoot his 22 rifle behind his house also. Sometimes he will climb out his bedroom window and shhot a few from the roof. Other times he walks down the street with a friend shooting squirrels from the road. All of this is illegal but for the most part I let it go. But when he was shooting from the street outside my house my wife called the police. When they came to his house they talked to him for a minute, looked at the pile of squirrels that he had (over the limit), and left.
My wife took a picture of him standing on the road outside our house shooting into the neighbors yard. Cops don't really do anything but burn some leaves in the fall and they will be at your house.
I feel your pain, I live in West Creek also. People shoot around here all the time. It is unnerving when you don't know where your neighbor is aiming. But if your neighbor knew where you were shooting and the precautions that you have taken it really may ease things a bit.
Good Luck.