Don't know what Turnbull does but as a matter of course Savage used to lengthen all Fox guns returned for repair that had short chambers. If the guns failed proof testing after chamber lengthening Savage replaced the barrels at their cost charging the customer only a nominal fee. Wish there were still folks around that operated that way today.
I wouldn't send a gun to anyone who would alter my gun's originality "as a matter of course" without first asking my permission - to which I would definitely respond with a resounding "Absolutely NOT!"
