When doing the badger cull test it was to get 3 rounds in a 3 inch circle at 70yrds. Some of you will scoff at that but there were quite a few who couldn't. I often think of that when out. Id say that as long as you can hit a 3inch circle for fox or 4inch for deer then when you can't, then that's your max range. That might be 100 yards or 500+