Thank you for throwing a wrench in to it. So I do a search on the Remington 700 .308....guess what? now lets throw the Winchester 70 stealth II .308 into all of this.
Why not the just plane TWS longer barrel

Look at the specs. The barrel is flutted, unlike the standard barrel 700. It's also got the break/ports in the barrel without having to have it ported or added comp.

I like it. :)
Open to ideas on the bolt. Range 100 - 800 yards

Well, whatever brand you go with, I would lean towards the shorter barrel lengths. Handy.

I have a 20" Rem LTR that has been great for the last year and a half, 2,000rds+ through it.