As Drew stated, difinative Lab testing is quite expensive. I do a fair amount of work as a Firearms Expert Wittness. I have been retained in many, many chamber failure cases with shotguns, rifles and handguns. Wether squib load, cocked wad,overload or underload,Inthe vast majority of these cases the culprit is the ammunition not the Firearm. Overpresure failures have several unique signatures, these appear present in the pictures.
I would personally focus my investigation on the ammunition.
I am curious to know what the head of the stock looks like inside.
Brad
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