RE: New/used .308 Savage vs my old trusty Marlin .30-30
I'd think it's more the rifle being very accurate than the "legendary accuracy" of the cartridge.
If you're dead on at 100 yards with a 150-165 gr bullet, you'll be in the vicinity of 3 1/2 to 4 inches low at 200. If you sight it inabout 1 1/2 to 2 inches high at 100 yards, you should be dead on at 200.