I have a 722 in .244 Rem that shoots worse patterns than my Browning 425. I've decided to re barrel it. I would like to keep it as a repeater, but I am thinking of going to ether 6MM PPC, or 6MM BR. How much magazine work would this requirer? Is it even cost effective, the easy thing to do is keep it a 6MM Rem with a slow twist for light bullets, then it's just a barrel change.