After posting, I then realized that I had a set of barells that I bought from an auction, for 15 dollars, thet were 28 inch and I had them fitted to another 28 ga repro. They worked without problem on that gun. I mixed them up and they fit fine and after shooting 15 shells, Winchester, it caused the problem, several times.
I shot the gun with the correct 28 inch barells and no problem.
There must be some small abnormal fit somewhere, or it could be the Winchester shells
In words of Ed Mudderlack, "investigation continues"
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