I no nothing about the Tubb 308 replacement bolt but I do know that the 6.5 Creedmoor has the same head size as the 308Win. Specialty pistols (XP-100) in 7mmBR are re-chambered and re-barreled quite often to other cartridges with the same case head dimensions.
It will work just fine, however, I urge you to look strongly at the 6.5x47Lapua. It has a ballistic edge over the Crede and better brass is available (Lapua).
I am not a handloader(I know a sin here) so looking at commerial ammo the 6.5 superformance is cruising at 3010fps the fastest 260 I can find is 2950 from conely precision ammo unless someone knows of another source.
I am not a handloader(I know a sin here) so looking at commerial ammo the 6.5 superformance is cruising at 3010fps the fastest 260 I can find is 2950 from conely precision ammo unless someone knows of another source.