Thanks again Rich. Please also confirm the chamber length and bore measurements just proximal to the bulges.
The issue is not to dispute Steve's statement, nor to assign blame, but to reach some conclusion as to the cause of the barrel failure.
It is my sincere hope that this will not end as
most posts regarding barrel/gun failures, at least on doublegunBBS and trapshooters.com, have ended; with no definitive, or at least learned, explanation. Modern guns sent to the maker for a failure analysis and metallurgical study disappear, and when litigation is involved, details of any settlement are made confidential.
Something like this would be definitive
To be clear, I have found no Specification Diagram for wall thickness from any turn-of-the-century U.S. maker. That information would be invaluable to those of us measuring wall thickness and providing an opinion regarding originality, and safety.