Anxious to see the images Gene.
Prior to any of us sharing our opinions (learned or otherwise wink ), it might be worth reviewing this protocol and an example of a blown barrel evaluation which was in The Double Gun & Single Shot Journal, Vol. 27, Issue 3, p. 17, 2016; to my knowledge the only published failure analysis

https://docs.google.com/document/d/1ZnptAPvQIlWG5n5UU2FmKcFpYtVmOSc4b7K7G9IBs4g/edit