With all the barrel choices available It's just too tempting. I then started to find holes in my arsenal and suddenly found the need for a 6X45. It will be a 22 inch varmint contour. My bullet choice will be mostly 70 grain match with the occasional 55 grain being tossed in the mix. What twist rate should I get with my barrel length and bullet choice take into consideration. Now I need to make up my mind on a barrel maker. Brux, Rock Creek or Criterion ???.