B French has inherited exactly the same understanding that I inherited...the story goes that Englishmen debated it for so long, that British gunwriter Gough Thomas (G T Garwood) did a published laboratory analysis of paper vs plastic and the pressure curves in short chambered guns. It has less to do with the maker than it does with the chamber length, why do you suppose the Brits were debating it? Because their short chambered guns were developing frame cracks too...and chamber bursts...
Hey, it rang of truth and sound reasoning back then, so I too accepted the concept with no further question.
Thank you Mr French...I owe you one...the last thing I wanted to do was debate a concept that I only adopted ...
Gough Thomas burned that debate to the ground back in the 60's...that's why I thought the Department of Redundancy Department had this covered.