With a chamber reamer. The chamber in my barrel was too short, and most likely had never been finish reamed. In all honesty, I believe that my "gunsmith" did not have the correct size of chamber reamer, and made do with what he had. I plan to have the chamber ledge cleaned up later on next year if things work out. At least it is headspaced to the absolute minimum, so I have some working room and still be within spec.
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