Here ya' go Dean. You sent me this long ago.
I would be less enthusiastic than Dr. Gaddy about a .066" end of chamber wall thickness. We are blessed today to have lots of measurements with which to determine original factory numbers, and that's the lowest (of non-chamber lengthened) I've seen.
That said, it is difficult to get the wall thickness gauge pin exactly at the end of the chamber. And because the angle of the forcing cone is more acute than the external taper of the barrel, forcing cone numbers are often slightly more than the end of the chamber
