I simply get tired of the amount of misinformation presented here by those who have never, nor will ever do what they are presenting as fact...
I'd still like to see any reamer that could be adjusted from the muzzle end of a shotgun barrel while in the bore.

Joe, Google BORING BAR, Lathe....
Then try to find out what an expandable reamer looks like...
For that matter, you might try to find out what a jug choke looks like.
I quit.