Daryl,
Actually, the .018" was a bit further up from the 12" measure. Somewhere around 15" from breech, maybe a bit less. The really odd thing was the non-concentricity. One side of the barrel closest the lower rib measured .018". The opposite side of the same tube was measuring around .028" to .035". Pretty extreme variation at the same length of measure.
At 9" from the breech it measured about .043" so the farther back one goes, the more normal it gets. There just happens to be a very thin area near the lower rib starting at around 12" from breech and continuing up to about 20" from breech.
This is all I can recollect from a couple days ago. Not my gun, not my problem. It is just that the owner is a good friend and I wanted to be able to give him the best answers possible because he is very fond of this gun and I want him to be safe and happy.
