I'm late to this very informative thread. I agree with others that there is very little difference between the .308 and 6.5 Creedmoor at the distances you are talking. I will also admit to the "coolness" factor of the 6.5 Creedmoor. That said, when I decided to add a 6.5 to my stable, I settled on the .260 Remington. The OP asked a couple of times about forming 6.5 Creedmoor cases from .308 Winchester brass. My understanding is that while it can be done, it takes several steps as the basic geometry is different. The .260 Remington, however, like the .243 Win and the 7mm-08, is a necked-down .308 case. Forming .260 brass from .308 requires exactly that: necking down (and checking for thickness of the neck brass). Virtually no ballistic difference between the .260 and the 6.5 Creedmoor, so the choice between them should be based on other factors. If ease of forming cases from .308 brass is a criterion, the nod goes to the .260 Remington. And I'm finding that with all the jazz about the CM, being a little different has its own "coolness factor."