Tamid, prevailing wisdom is that a blown chamber is high pressure, and a blown barrel further down is an obstruction.
Obstruction is always accompanied by a ring bulge.
This is no matter what the barrel composition.
I've not personally experienced any blown guns, but have seen firsthand the results of both - in fluid steel guns.
Modern fluid steel barrels have a tremendous amount of elasticity. The result of a 20/12 accident in a Beretta 390 was a HUGE ring bulge, a shattered fore end, and very slight hand injury.
A Lanber that blew the chamber as a result of a very careless hand loader behaved as expected, and this would have happened with any barrel made of anything.
Fortunately, such accidents are few and far between but the human element is forever with us whenever we participate in ANY activity.
