Shot it again today, and it was still doing it's thing. I took the whole top end apart completely so I could check the breech block in the upper, without any other parts dragging on it. I also checked it with feeler gauges, and found that the rails on the breech block were a tad too wide and dragging slightly on the bottom of the grooves in the upper. I polished this to fit, and polished some more on the rails. After that, the breech block would fall right in without resistance, so any problem from now on must be located somewhere else. The ejector felt a bit gritty, so I polished the groove just for good measure.
Now it will at least shut close on an empty casing inserted in the chamber. I'll try it again tomorrow, will also get some Winchester "white box" to see if it makes a difference.
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