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Just seems to me that the SS pins are an abrasive method that actually takes brass off the case versus traditional walnut or corncob media, which is a polish rather than an abrasive.
Getting the brass that clean, while nice, does not have any real benefit. If the traditional tumbling did not clean the brass good enough, you weren't tumbling long enough. I typically tumble for 8+ hours, but that is because I will tumble overnight or during the day when I am at work.
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