Before I would pre-order or buy a Tikka in 6.5 CM I would want to know how the longer VLD's will fit its throat.
Tikka is already producing a 6.5 in the CTR. So those measurements are out there. I have one, but hadn't done anything with Berger bullets (and honestly don't plan on it) because it shoots the Hornady 140, 143 and 147 so accurately. I'm getting 10 shot groups under an inch with the factory 140ELD-M load -- some under 1/2".
I see the same results from my buddies and all over the Internet. I wouldn't worry too much about their reamer specs given the actual field results of their current 6.5 Creedmoor's.
A 6.5 CTR, IMO, would be about model perfect for a pronghorn rifle! The more and more I keep hearing/reading about the Creedmoor, I sorta lament getting in on the 260.
