The Rem 700 is certainly a better qualified firearm for your intended purpose and use, with loads of history to back it up. The only thing I would weigh a bit further is the use of a 26-inch barrel in lieu of 24-inch. At 1,000 yards it is mandatory, at 600 yards it is preferred. I am wondering if you just couldn't put one together for yourself. Find a SA Rem action, buy a super match grade barrel (Shillen or PacNor) add a McMillan MilSpec stock and your in biz. No chance of that setup not shooting 0.25-inch MOA with the right 308 Win loads. Action and barrel cost will run $700-$800; stock $300-$500. Not much difference in what you would pay for the 5-R. No matter how you look at it, a custom barrel is hard to beat and Mcmillan, in my opinion, wrote the book on MilSpec stocks and have a track record of shipments to the DoD to prove it.