I would Think thats pretty safe my friends house is a lot closer than that to a farm where they have a small range that they shoot at and the birm isn't even close to what u have. maybe he is afraid that he will be on his back 40 while u r shooting or something. It would be good if u could come to an agreement that you could give him a heads up when your are going to be out shooting so he knows not to be wondering around back there.