all my brass is cleaned fine inside, just some staining from burning powder.
and the media does move in and out of the cases, i can tell because when i add a couple of caps of mineral spirits to my media to "freshen" it up, the media in the cases gets wet as well. this would not happen if the media did not move in and out.
also i recently had a few pistol cases jammed togeather, when pried apart where the brass walls were in contact was still dirty, but inside the cases where the media was trapped was nice and clean.
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There is only one tactical principle which is not subject to change. It is to use the means at hand to inflict the maximum amount of wound, death, and destruction on the enemy in the minimum amount of time."
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