I had one ground with a .298 neck, which is for Lapua brass and allows for .003 clearance. I also specd a .047 frebore which allows a 123gr SMK loaded to 2.800 oal to have a .012 jump. I have never been able to get the velocitys I expected with 3 different bbls by 2 diferent mfg's. I have contemplated throating .010 at a whaack to see what it would do. But all 3 bbls will Hammer!