Roper,
I have shot my 280AI out to 300 yards on a couple of occassions if that is considered long range. The way it performed was good and the trajectory was as I remember pretty flat. I was about 1 3/4" high at 100 with a 140 Nosler BT @ 3100fps or there about and it took one click up on the scope to get the point of impact in the X ring on a 6" splatter bull.
I think the thread has ran so long because the discussion has been very friendly and laid back and there have been a few wrinkles thrown in along the way. With that being said as soon as the weather straightens out and we get a few dry days so I can cut the bottoms on my farm I'll be able to stretch the 280AI out to 500 yards and give all a report on the results. Hopefully we are only about a week away.
Good Shooting!!

Dave