Mark,
The first time I used Ballard Brass (now RMC) shells in my 1881 10 gauge I experienced blow back as the cases were fire formed to the chamber. Nothing came back in my face and I did not notice it at the time, however when I cleaned the gun there was powder residue under the forend and on the water table etc. I have not experienced it again. I think the brass fits the chambers and now form a good seal to prevent blow back.
Harry
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