Re: Remington 700 sps tac or savage 10fp
both will reach out and touch the target effectively in the right hands(600-800 yards). although a .308 could reach effectively further, anything past that distance would be better suited with a different cartridge.
i'm a savage fan, but i'll try to be unbiased:
savage is surprisingly accurate, at a lower price. gives you more $ for extra accessories and ammo. savages are like the bastard child of the tactical world, but in my opinion will run and surpass most in the same class. this is the one i would pick.
the remington is great also, will have a higher resale if you ever decide to go that route, (not knocking "big green" but this is like a pair of designer jeans for the ego minded), the 700 probably has the better receiver, in case you want to do a custom build later, it comes in handy. it is a tried and true rifle in wartime and in peacetime.