I was on a road, +- 350 feet from where I estimate the target was... He was shooting downhill across a small ravine. I was on high ground on the other side.
(Edit) Anytime you set your target up on your property line and shoot into somebody else's land or road, you're taking a risk. A few years ago I was walking a power line doing an herbicide assessment when I noticed the abutter's target was set up so that he was shooting into the power line. Coming back through, I had just gotten past his shooting lane (<200 feet beyond) when they began shooting. I guess that it's perfectly legal, but you will never convince me that it's safe to fire when somebody is 100 yards or less in back of your target.