Re: 308 ammo
Some candidates would include the Bushnell elite 4200 series, Nikon Monarch, and the Sightron Big sky series. The power level depends on what you would like. You can shoot 1000 yards with a 10 power scope but higher is nicer. Also, the highest power on the scopes will be greatly affected by mirrage on hot hot days. Others can give you better advice on what power and scope.
Also, as far as the bullets go... try a few different match grade loads and find the one your rifle shoots best.
I used to re-load but now I "hand-load".
-- Well, at least I try