I don't think there's any question that equipment has improved greatly. What hasn't changed is wind. And from 600 yards and beyond the wind becomes more then a major problem. At a 1000 yards a small breeze becomes a major factor throwing the bullet off by feet.. At 1500 yards,you haven't got a [bleep] clue where the bullet is going to hit. But then again who cares because you aren't taking a bullet.

As for arse shots on game at close range. If you use enough bullet the outcome of an arse shot is more certain then any shot taken beyond 500 yards.