Lots of good suggestions here. I shoot a 7 mag, but intended range is double what you posted. Here's the interesting part, I'm shooting the Berger 180 gr hunting VLD, and getting amazing results even beyond 1100 yards. Those bullets are still expanding well and just ruin a rock chuck.
After a lot of research, I would consider the 6XC using the Berger hunting VLD.
A guy I shoot with at our local long range matches is shooting a 260, and that has proven to be very effective to 800 yards, the extent of our range.