Seems to be a rather touchy subject... Well, my biggest buck dropped with one shot at 500 yards from my 300win mag. It was a mule deer out on the South Dakota prairie, and there was no way to get closer. The furthest shot I've ever taken on a whitetail was about 350 yards. Not that I wouldn't feel comfortable shooting further, just that it's rare to get a shot like that in whitetail country. Now, all this about 1000 yard shooting? I would do that if I had a tripod mounted MK-19. But there may not be a trophy left after a hit with that.