There have been several threads over the years over on trapshooters on gun blow ups which usually lead to 200 post threads with no consensus as to what caused it. A barrel obstruction is not going to do catastrophic failure such as this gun experienced. I am one that subscribes to the theory that it is shell detonation that causes this much damage.
Problem with that is that you can not intentionally load a shotshell to detonate to prove it and some say it is impossible for a shotshell to detonate.
However damage looks similar to rifles and pistols that have experienced detonation,looks like a small bomb went off.
John
