I have two of them, set up differently......28" heavy straight K&P, and a 25"Schneider Rem Varmint contour. Both are 12" twist, braked. One uses PMC 22-250 brass necked up, the other uses WW .250 Savage necked down. The idea was a 6mm with performance not too far behind a .243 but using enough less powder to cut way down on heat and fouling. It does that fairly well. The 70TNT with W760 is a good combination. In my guns the best is WC844 with a 65 - either VMax or one of Keith's nasty 65gr HP's - at about 3690. But after having these since the mid-90's, if starting from scratch I'd do as Keith said and just make it a 6-250AI. If choosing between 6BR and 6-250, I'd stay with the 6BR which pushes light bullets only slightly less fast, is stupid easy to make shoot, and uses a whole bunch less powder.
