Just an opinion, but I've never been a fan of bolt actions chambered in cartridges that we designed to solve the constraints of the AR platform. Might as well stick with the old .243 at that point if you really want a 6mm. A flavor of 6.5 might be a better choice.

So, if you've decided on 6ARC and just deciding on the platform, then why not stick with the platform for which the 6ARC was designed? Can you go SBR (pistol) length? If suppressing, I'd rather to an SBR, then they weight savings from CF stops dropping off too.

Personally, my 'deer gun' is a 12.5 6.8 SPC AR