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Yes a different tumbler is needed. I use a lapidary tumbler for rocks. The Gun world now has it’s own version. Brownells or MidWay USA sell wet brass tumblers. For me wet tumbling is allot cleaner. No dust from the media used in dry tumbling. Better results in less time.My brass usually starts out a lot cleaner than that 43 Spanish brass and the walnut makes it clean and shiny. Do you use a different tumbler? All I have is a generic Midway vibrator.