A discovery I made a few days ago - that I thought was a firing pin dragging or hanging up in a soft primer - turned out to be the brass shell head expanded just enough on the right barrel only that it was very hard to open the gun. It is an extractor gun. I think an ejector gun wouldn't have this problem...?
I dressed and polished the firing pin tip and that made no difference at all. Now I'm gently honing the right chamber and each time I recheck it there is a bit of improvement. Shouldn't be long now.
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