Something to consider:
When you eject your empties,are you muzzle up or muzzle down?
Muzzle up is good.If you are looking at the brass as you eject,any powder fouling crud falling out of the cases will try to find its way under that star shaped ejector plate .Then the ejector will ride a little high,with mushy crud under it.That is what your rims will be resting on as the hammer falls.
If my guess was right,clean under the ejector ,and get in the habit of pointing the muzzle at the sky as you swing the cyl out and press the ejector rod.
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