<<<<<< is not a expert. It's been my experience that 1 in 8 Is good up to 220 grain. The Berger 230 and Sierra 240 seem to do better in 1 in 7. The most accurate bullets that I've found are the barnes 110 grain tac-tx fb followed by the Sierra 125 grain pro hunter. I find this to be true in both my ARs and bolt guns.Naturally the barnes made for the BLK is expensive and hard to find.