Brux was the bbl. on my first custom, purely competition rifle(long range and PRS style). Novice that I was, I got a lighter contour than I should have, so driving it was a challenge, BUT......it was a laser. Marc Soulie at Spartan rifles put it together for me in 7mm-08. Shot in the .3's and .4's (MOA) for over 3500 rounds (a more accomplished shooter probabably would best that). Started to shoot into the .6's -.7s around then and I finally rebarreled at 4200, mainly because I wanted a medium Palma countour. It probably would still shot have better than I could so I kept the barrel with an eye to making a hunting rifle for the grandkids one day.....if they can shoot better than a 3/4 minute rifle, I'll get 'em a new one! It was a 4 groove and one of the easiest barrels to break in/clean I've ever had. Highly recommend them.