Interesting topic. From what I've seen they are pretty durable on physical and mechanical testing procedures. Blowing one up on the otherhand....I don't know.
Once....Glock 40. Watched it happen at the range. It was a reload believed to have a double charge. Mag blew out, slide and controls all blew out, no major injuries.
Don't think I know anyone that has blown one up. Know a few guys that have blown up revolvers and 1911 usually double charges.
Fred you know way more then I but don't most pistols that aren't blowback actions lock the barrel to the slide similar to a 1911? If so if both the barrel and slide are metal isn't the frame material somewhat irrelevant?
primer dimple seems wierd to me...seems like i remember another smaller ring generally shows around the primer hit ..that failure is pretty bad and definetly out of battery. how many times has the shell been reloaded fred? also i would be curious to throw a caliper on the shell and check if it was out of round any. Were you for sure in factory case length spec?