Did you try REALLY hammering on the ejector rod?
Like in a "ohmygoshIhavetoeject&reloadrightnoworIdie" type force on the gun?
Might be pleasantly surprised?
Just a suggestion for the next time you shoot it.
-J-
Yep. The ejection rod would come right on down, but it would PASS the casing without grabbing it. I think that this was an issue of rimmed/rimless. It didn't get a good enough grip on that particular casing, (which was tight because of chamber being slightly out of spec, I assume, since it ONLY happened on that one chamber, EVERY time,) and so couldn't strip it out.
Hopefully some more shooting will wear it in a bit more.