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I believe you can. My reloading setup used to be in my basement. Once, I had put a bunch of nickel plated 45 Colt cases into a tumbler with walnut media and proceeded to forget it was running for two days. When I removed the cases, they looked like CCI Blazer aluminum cases. Completely dull. It was obvious that the tumbling had damaged the nickel plating. I doubt that corn cob media (softer than walnut) would do the same thing, but it seams reasonable to assume that excessive tumbling could slightly damage a case. Whether this could actually lead to a failure, I don't know. The damaged nickel plated cases showed no difference in usable life compared to undamaged cases so it could be that the damage was purely cosmetic. Ultimately, I see no reason to tumble cases to the point of polishing to jewelry quality. I'm only interested in removing any dirt, crud or powder fouling which may be detrimental to the functioning of the firearm. Any excessive tumbling after that only reduces the life of your media.
Hoss
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I ain't as good as I once was, but I'm as good once as I always was
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