O.K., BB is on the sideburnner now, I can always use what I have for the outside of the barrels. I'll try the MX when it arrives. Again, I have been told not to use petroleum based oils in the barrels of ML's, am I misinformed? When do you use the oil in the barrel, after cleaning of course, but do you swab the bore dry befor reloading? It has never interfeared with your powder?