In 2017, I was able to only shoot 2, 600 yard matches with the 6 BR-A and my results were less than I expected. However, I believe that it was not the cartridge, but the fact that I did not develop a consistent load before the match. Now I have about 400 rounds down the 8 twist Brux and believe that I have a load (and tuner setting) that will work (we will see). My best and most consistent load to date is as follows: 30.6 gr. H4895/ 105 Bart Infinity @ .005 off lands / Fed 205 primer. However, the best laid plans of mice and men often go astray, and competition will show the true merits of this combo. Good shooting and happy new year. James PS- The above group was shot with the above described load at 200 yards (3 shots). This same load shot a 3-shot group at 600 yards at about 1.1 inches in less than ideal conditions.