So as to not create further confusion in another thread - this chamber rupture was discuss here in "Off Topics" 10-2017 (accessible only to PGCA members) and mostly here
http://www.doublegunshop.com/forums/...=491058&page=1
There was a great deal of discussion, some inane and some enlightened,
by the usual suspects, and by a witness to the event. I contacted the owner of the gun last fall, and did so again today expressing my interest in evaluating the remains.
This was the postulated,
but certainly not confirmed, initiator - the top rib extension screw drilled too deeply, possibly into the medial exterior chamber wall
None of us can make a definitive diagnosis without these questions answered, and a hands on examination
The critical information needed:
1. Exact chamber length
2. Exact chamber dimensions (for evidence of previous honing). The entrance to the chambers of c. 1900 12g U.S. doubles is usually .809” -.812”, tapering to .795” - .798”.
3. Exact bore dimensions (for evidence of previous honing)
4. Minimal wall thickness at the end of the chamber
5. Minimal wall thickness at the forcing cone
6. Minimal wall thickness around the burst edges
7. Does the burst barrel appear to have a “ring bulge”?
8. Can you confirm that the load was factory? Which Remington Nitro load? If not, what was the reload recipe and the expertise of the reloader?
9. Is there visual evidence of over-pressure on the remains of the shell? Extractor imprint on the brass? Cratered primer?
10. Did the shooter notice anything abnormal the previous shot through the burst barrel? Sound? Recoil?