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I stopped at the china depot (harbor freight) and picked up walnut shells. This is listed for blasting and tumbler
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Yep, same stuff I've been using for several years. It doesn't pack into the brass and you don't have to pick it out of flash holes. If for some reason I can't find the blast media, I get lizard litter at the pet store. It's the same stuff and buying it locally is cheaper than buying special brass media.