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1) Here are my two Browning 12 ga A5 muzzles.
a) One was swaged out by Stan Baker from outside diameter 0.839" to 0.876" before it was reamed and tapped.
b)The other still has the factory full choke and the barrel is .823" outside diameter.

2) Different choke systems are needed for thin barrels:
..a) I am set up for 12 ga Rem Choke in a few pilot sizes. 32 threads per inch system. I need a barrel to be .845" diameter.
..b) Winchoke is also 32 TPI and needs .845"
..c) The Tru Choke system with 44 TPI needs at least a .825" barrel muzzle.
..d) The Tru Choke Thinwall aslo with 44TPI needs at least .805"

3) After reaming and tapping for Rem Chokes in many shotguns, I have found the preparatory reamer to be slow and the tap hard to turn.
So I have been quickly cutting with a boring bar to get close, then the reamer, and then I power tap using the engine lathe.

What does it all mean?
I cannot modify my full choke A5 with the Rem Choke tooling I own.
But I have been shooting steel shot through it for a long time, and it is still ok.

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. -Ernest Hemingway
The man who makes no mistakes does not usually make anything.-- Edward John Phelps