I get my brass clean, not necessarily sparkling clean. I have tried all methods including ultrasonic cleaning of the 308 brass. It sure does a job on the brass. Looks clean inside and out. I have been using corncob media laced with some Iosso polish. This combo seems to make the brass size easier. Just perception of course, and not scienetific in any sense. I have many polish additives, Flitz works well, NuFinish Car Wax works well, Lyman additive.
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