Sometimes, certain brands don't work well in certain shotguns. I had problems with Clallenger 12ga sheels sometimes slipping under the ejector & getting stuck in my Perazzi. Hell of a time trying to pri it out. Found every so offten the shell base steel measured .020" undersized & steel head base was much shorter than other manufacturers. The Challengers worked OK in my Krieghoff, because the ejector throw was much shorter than my Perazzi, & did not slip under & behind the ejector.
Also, your chamber could be slightly under sized (there is an exceptable +/- in chamber size) and/or the Rio sheels could be slightly oversized. Get the caliper out & do some measurements.
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