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Dirty brass is bad looking and bad for the dies, I clean before resizing.
The next thing I'll say, is hearsay and I don't know to be fact, but I've heard that too too clean of brass isn't good either. something about it could be slippery enough to not grip tight in the chamber and increases thrust against the bolt face, and that the military stores its ammo open to the atmosphere so the cases will oxidize some and not allow that to happen. Again, just something I heard. It sounds feasible to me though so while I like clean brass, I'm not anal about it being super shiney etc.
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