That information from the Sherman Bell experiments is all old news Drew, and repeating it again still won't make you any brighter. Neither will the use of big words that you probably don't understand.
I don't know why you are hung up on the fact that I haven't given you any wall thickness measurements from barrels which have had their chambers lengthened???... aside from your childish and insecure need to attempt to discredit me. Miller and I spent considerable time trying to explain that YOUR assertion that chamber lengthening in vintage doubles could result in GREATER WALL THICKNESS at the end of the recut chambers was wrong. Miller even gave you a picture to simplify it, but you still didn't want to accept the obvious.
That should have told everyone here what is glaringly obvious to me. You are not a shotgun barrel expert, and you don't have what it takes to ever get there. Copy-and-Paste regurgitation of other people's work and metallurgical terms isn't going to change that. And all the measuring instruments in the world are not going to change that either. Nor will contacting Zircon again.
And your decision to launch your personal attacks on me over the last couple years insures that I'll continue to remind everyone what a dim-witted phoney you are. I'm guessing that isn't the "eternal significance" you spoke of in your "Down One" personal attack thread. I'm not sure why you call me William. I have been called Keith since I was an infant. But if that makes you and your friend SKB feel like more of a man... then by all means keep on doing it... You both need all the help you can get. Have a nice day.