Bob; buy a case tumbler from Dillon. Also, get some of their brass cleaner which you add to the media. Use ground walnut shells as your media; this is also available from Dillon.
Corncob media, the other type available, has a larger particle size, and particles tend to get stuck in the flash hole.
You can also tumble your loaded rounds to remove fingerprint oils, and leave a protective coat from the brass polish on the cases.
It is worth the cost. Walt Welch
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