Lots of information here
https://docs.google.com/document/d/1...vwLYc-kGA/edit
and
http://parkerguns.org/pages/faq/BarrelThickness.htm
NOTE: the image on the FAQ is NOT wall thickness recommendations; it is the dimensions used for the barrels evaluated by the Birmingham Proof House Trial. There was no chamber cut.
Scroll down a bit here
https://docs.google.com/document/d/1...EK8OtPYVA/edit
I would observe that doublegun dealers now commonly run a wall thickness gauge down one side of a barrel and pronounce the barrel as "fine with a MWT of .030". As said,
that number alone is meaningless and if a dealer, or the smith evaluating the barrels, can't provide the minimal wall thickness after measuring top, bottom and side (because of eccentricity) of the end of the chamber, the forcing cone, every inch to 9" from breech, and 9" from the muzzle, and MWT
and where, a second opinion is mandatory.
BTW: I will have a table near the Parker tables at the Vegas show, and will have my bore gauge and wall thickness gauge to provide barrel evaluations, for a fee to offset the $375 table cost. I'll post a reminder as we get closer to the show, and I'm looking forward to meeting more of my "imaginary internet friends" in person
