Well the reminder of the old thread is welcome remember you are dealing with geezers here that forget stuff almost as fast as we learn new stuff. .030 makes it time consuming to sand, lap or hone.

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The fact the new ones are not made by SA and knock offs may vary in outside dimensions would make building a fixture to bore them on a CNC lathe more difficult. A CNC could bore the taper to exactly match the barrel at 22 inches or any other point on the barrel. A fixture could be set up so the coordinates for the length would be repeatable. So it could be set up and small batches run from time to time. Not sure it would work with knock offs. If anyone wants to try it out send me an original and a knock off.

Toolroom lathe joke:

Originally Posted by Ray Behner 
Your wife says, you love that stupid machine shop more than you love me, don't you?
YOU( truthfully) Just a place where I work.
Her: "You love that darned Lagun vertical mill more than you love me, don't you!"
You: (Truthfully) No! No I don't!
You: (Thinking silently to yourself) "Please, Lord, don't let her ask about the Hardinge HLV-H"