Wonder what would happen with a 3r gain twist going from about an 8 to a 6 and a 130gr hammer started about 3400? Be bad news for anything it hit, if it wouldn't strip the rifling.The one thing I have learned with Hammer's is "park" what you think you know and listen up. I learn something new every time I shoot them. One absolute for me is harder I drove them, the more accurate they were for me. I am using 1:8 for my ".270TH" but like to get a 1:7 next!