Glad I could help! Given your intended use and bullet choice, it sounds like your idea would be doable. Now I'm really curious.
Given the velocity potential of the Cheytac, I would plan to stay with mono metal bullets of some kind. Bonded bullets at the very least. Either way, I am thinking that it would pay to go with a faster than standard twist.
What do you have in mind for recoil control? Muzzle brake
? Heavy barrel?