I want to build a 20-22" heavy barreled carbine. Which cartridge will give better performance with that short of a barrel. 260Rem, 6.5x47, 6.5 Creedmoor, 6.5x55? I wanna run heavy bullets, not to 1000yds maybe to 5-600. This is gonna be for hunting whitetail and general use, along with some...