A friend of mine, that is a competitive shooter, found a deal for me and I picked up a 6x47 Lapua 6.5x47 Lapua necked down). The round is ridiculously easy to load for after you buy the brass and complete the necking down process. I loaded it with Varget and 105 Berger Hybrids.
We found out, shooting against competition rifles, that 6 BR, 6 Dasher, 243, 6 Creed, 6x47 Lapua 6XC... are all FAIRLY close in performance. It literally had more to do with the barrel than with cartridge choice. I vote for the Lapua for one main reason. The brass. After 8 shootings the brass had not needed to be trimmed or annealed. True, I was not pushing it, 2970fps. but the accuracy was incredible.