I would have to guess how Parker opened a choke on finished guns. Agree with Kevin probably hand hone while checking pattern and point of impact as the opening progressed. Doubt if any gunsmith today is doing it that way.
If using a machine or hand turned reamer after the gun is finished problem is how the barrels were regulated. Regulation is bending with wedges wired in place with ribs laid to maintain regulation. How much was it bent were do you index the reamer ? The bore may be straight may not be. Don’t know about 21s guessing again they may have been set up like a Rifle or modern O/U shotgun regulation and bore interior dimensions set by precision not hand regulation.
Willam
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Threaded Mode