Whether or not the 6.5 Creedmoor will "outperform" the 30 cals is a matter of specifics. You can definitely shoot some of the newer .308 bullets out there that will give you better performance. There are many factors to consider, one being that 6.5 Creedmoor barrel life isn't nearly what a .308 Winchester is.
That's an interesting comment. While I think about the possibility I might shoot the life out of some of my .223/5.56 barrels, and maybe some of my pistol barrels, I never considered I would put that much volume through my long range shooters, But I am thinking a barrel should be good for 5000-10000 rounds if not more.
What barrel life numbers are you thinking with respect to 308 and 6.5 Creedmoor barrels?
Well...others would differ.
According to Owens’ presentation, in testing in 2017, special operators shooting rifles modified to fire 6.5mm Creedmoor were twice as likely to hit their targets compared those using control guns in the existing 7.62x51mm NATO cartridge. Special Operations Command also evaluated .260 Remington and collected data on the performance of all three types of ammunition in the FN Mk 20 Mod 0 Sniper Support Rifle, the Knight’s Armament Company M110 Semi-Automatic Sniper System (SASS), and Heckler and Koch M110A1 Compact Semi-Automatic Sniper System (CSASS).From Special Operators Getting A New Round For Their Precision Rifles And An 'Assault' Machine GunThe testing also showed that the 6.5mm versions of the weapons have 40 percent greater range and less recoil than their 7.62mm counterparts. The round was 30 percent less susceptible to wind drift, as well, making it more precise at those distances.
You do have a point about barrel life if the Creedmoor is loaded hot.