I have a Kimber classic in 300WSM that shoots reasonably well producing 1 inch to 1.5 inch groups with 180 grain bullets and 67 grains of RL19. It shoots well after the bore is fouled with 2-3 rounds but at least the first two fouling shots are off a few inches. The rifle is 3 years old and purchased new. After cleaning the barrel yesterday and examining the crown which I do from time to time on all my rifles with a 15X loop, the light entered the barrel such that I could look about a 1/2 inch down the bore. I noticed circular tool marks on top of the lands, AND in the grooves that extended into the bore as far as I could see. I do not own a chronograph, which is now on my short list of needed items. The marks are tool marks as they are very regularly spaced and are perpedicular to the bore such as a reamer would make. I am pondering replacing the barrel, but wonder if the tubbs final finish product would produce a smoother bore and possibly better accuracy/velocity? What is the consensus on the tubbs final finish product??