Individual '06s can be fine long range rifles; however, if you wer having a long range 30 cal rig built, you'd probably opt for the .308Win, for the marginally better accuracy potential and sightly lighter recoil, or if you wanted to launch heavier bullets than the .308 can comfortably handle and/or want a reduced time-of-flight, you'd want a magnum.
There's nothing wrong with the old '06, it's just not a specialist.