What you're saying, Brad, is exactly what I first suspected, but the shell fired from the offending side drops right back into the chamber fully, and even seems loose, or at least the same sort of clearance as the non-offending side.
The indentation in the primer is visibly deeper than the non-offending side, and there is evidence of the firing pin dragging on the lower edge of the indentation.
A while later, I was using one of my non-ejector guns and experienced the same thing, so, to try and eliminate one or the other (Chamber vs firing pin) I took the extractor out, fired that barrel, had approximately the same resistance to opening, then poked the empty hull out with a dowel, with no resistance.
What bugs me is that when measuring the firing pin protrusion on the offending side, it seems no different than the side that gives me no issues. It just seems that that firing pin goes further into the primer than the other side. They are obviously in a rebounded position at that point, but for whatever reason, the travel seems greater on firing on the bad side. Can the body of the hammer actually contact the pocket in the frame if it were dry fired excessively? Worded differently, what stops the forward motion of the hammer when there's no shell for the pin to contact?
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