If i was shooting lighter bullets at a max of 600yds. I'd sell the long action and build a 6.5x47 lapua or a 6.5creedmoor on a short action. Both cartridges are very capable within that distance, they use less powder, the brass is cheaper, they have excellent factory ammo, the barrels last longer, they have a lot less recoil, and are thus more fun to shoot. I have taken deer from 140yds out to 980yds with a 6.5x47 lapua. Though I will not take a shot that long, with that rifle again, it did it's job.