Wow. After a 3 year break, this one is back on top!
Anyway, my furthest actual shot at a whitetail was a lasered 363 yards, and a 308 with a 165 NBT did the dirty work handily.
These days, I'm about as likey to have a 308 and the 168 AMAX or the 243 and a 95 NBT in my hands while deer hunting. Both topped by a SWFA SS 6X MQ scope with the dope on it.
Still, far to me is 500 yards, although I shoot regularly at up to 600 just because.
I wish I had a place to regularly shoot out to 1,000 yards like Big Stick. I'd probably go further if I had more trigger time at longer ranges.