The Grendel Kool-aid drinkers will neglect to tell you that once you step away from the 123gr match bullets it's hunting bullet ballistics aren't so hot. Antelope would be OK at 500 yards, but I wouldn't take a shot at whitetail past 300. Larger game has been taken at longer ranges, but the ethics of that is questionable under ideal circumstances. I'd get a 260 Rem over the Creedmore simply for brass availability.
These are from 16" barrels except for the 30-30 and 223, they are 20":