If you are shooting F Open, the sky is the limit, so long as you stay within the rules. I chose a BAT 3 lug, left port, right eject action, Brux barrel, Masterclass F Class laminated stock, Jewell trigger. It is really a stellar rifle. The main reason I chose 6.5x47 Lapua is the long brass life at pretty high pressures, IIRC 63KPSI. The small primer pockets don't have the same tendency to open up and get loose as do large primer pockets.
The Creedmoor is a neat cartridge, but from what I've read brass offerings are not as good a quality or longevity as is Lapua, and neck turning and all that being a PITA, I would rather only have to do it rarely rather than often each time I buy new brass.
Now I have only read about it, so please don't think I know what I'm talking about, but the other feature of the 6.5x47L was the steep shoulder angle, which as I read about it, created the focal point for the burning gases inside the case neck rather than the throat of the barrel. From what I read, in theory at least, this should increase throat life of the barrel, so it won't have to be replaced as often as a similar capacity cartridge with a more tapered shoulder angle, such as the 6.5x308 or 260 Remington.
These were the factors in my decision. As far as barrel replacement, it is something one must do periodically, as barrels are expendable resources. When this Brux is gone I think I may try a Pac Nor. Tho at the rate I'm shooting it, this may be my grandchildren's prerogative, as 60 rounds fired in 2 years, at this rate to make 2500 rounds I'll be long dead!
To OP, find the cartridge you like and go with it. Build accurate ammo and have a fun time. If your means allow, experiment. Maybe build a switch barrel rifle in 6.5x47L, 6.5 C, and 6.5 R, and see which one you like better?
Life really is short, and in the end it is the nut behind the bolt who wins tournaments. The FTR boys often shoot higher scores the the F/O guys, so the 308 is still a very competitive cartridge.