I run a very tight non turn neck on my Dasher. But when measuring the COAL on a clean barrel vs a 150 plus shots, it vary by about .015 in length. So when loading .01 from the lands wit my 70gr BT, after about 25 shots the bullet gets suck in the lands. I am not one to clean my barrel to death, and frequent cleans on a hunt is not always possible. Will the carbon ring stay the same for x amount of shots? What is the best way to consistency? The long range guys cleans a lot less. My best groups was shot with 120 shots down the tube..