fitting a lock to a round barrel

[looper]

I've got a question about fitting a lock to a round barrel. Since the lock bolster is flat, is it preferable to lap it to the contour of the barrel?

[smylee grouch]

I would file a flat spot on the barrel where the lock bolster mates up.

[Jim Chambers]

Definitely file the side of the barrel flat.  The other way is not historically correct and makes no sense, especially since most round barrels have a "wedding band" at the breech end that would have to be inlet into the lock bolster.  Every old round barrel I've seen had a flat spot on the lock side.
Jim C.

[looper]

That does make sense. Thank you.