I've got two X-Caliber's currently, a 5.56 and a 243LBC which is relevant since that might as well be 6ARC. It's not a Bartlein but it didn't cost that much either. It was very easy to find multiple loads that consistently shot under 3/4 MOA which is about as good a shooter as I can say I am on average. Plenty of sub 1/2" stuff if I really work hard at it, but I hate shooting groups and intensive load development so I probably haven't fully explored the barrels capabilities.