Shooting factory ammo, I think the 243 is the best choice, then 260. Lots of different ammo readily available for the 243, more so than the 260 where I live. With that said I have both, a 243 and Creedmoor. Only Creedmoor ammo I have ever found locally was the Superformance/129 SST loads. Did not shoot well in my particular rifle-2.5"+ groups. Handloaded hunting rounds are much better, 1" or less.
I am also having another Creedmoor built. I think it is the perfect, low recoil, whitetail cartridge. However, it will not do anything a 243 or 260 cannot do. Personally, I like the heavier 6.5 bullet choices.
If cost is a consideration, pick up a 700 ADL in 243 from Academy Sports-<400.00. Swap stock and trigger for a nice low cost rig.
