Interesting your 308 is more consistent than your CM. I’m used to the CM being pretty solid.
I’ve shot one PRS match with the Ruger RPR in 6.5CM and it was pretty nice. The 6.5PRC is tempting me though....if you can put up with the slightly higher recoil and not let target re-aquisition time suffer too much the PRC is pretty consistent (comparable to the CM) plus another 200fps or so with slightly heavier rounds. I’m used to shooting the Horn ELD-X. The PRC can also be used a little further out for game.
But what I’m really thinking about is the 300PRC vs. a 338 Lapua for ELR shooting. That’s getting kind of exciting....
...But then some jerk shows up at the range with his black powder muzzle loader and with open sights hits out to 880 yards. Puts it all in perspective. LOL!
I'm reloading for both rifles, and part of the reason is that I haven't found the magic load for the Creedmoor that will make it shoot as tight as the .308. I do know that slowing the bullet down a bit does make the CM I have group better. The 6.5 is a newer rifle than the 308 though. I'm probably still getting used to the hold, trigger, etc.
I can definitely see where the 6.5 CM is an excellent caliber for a bench gun. But, I don't do much bench shooting. Most of my shooting is over a bag thrown on the hood of my truck and shooting at 500yd+ coyotes and hogs that aren't usually standing still for very long.