If you look back a to my original post in here I said take advantage of the longer magazine and use a larger case like the 6.5-284 Norma (I called it a Lapua) or the 6.5-06. I don't see any advantage of running a short action cartridge in a long action rifle. I really don't know your intended usage of the rifle but the only down side to running either of the larger cartridges will be shorter barrel life and more recoil. The advantages are faster velocities, flatter trajectories, less time to target, and more energy delivered if hunting.
I guess I just figured if you were looking at the Creedmoor you would be reloading. If you are buying ammunition I'd just buy a .308 in a short action or run a .30-06 in a long action. I see no advantage to running a the Creedmoor if you are going to be dependent on using factory ammunition.
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