Follow-up question: why doesn't Tikka offer a 6.5 CM in their rifles? Or do they offer it and it just isn't on their website?
They do offer it. They just don't import it regularly. You can get a big Tikka distributor to have one shipped over if you can find one that is willing to do so.
As for twist rates, my Ruger Hawkeye Predator is a 1:8 and shoots 140 Bergers fine.
Lots of discussion and good info at www.65creedmoor.com
and a great bunch of guys.