i use the fine walnut media from harbor freight, super cheap btw, it does not get stuck in holes at all, at one time i put nushine car wax in the media and did not let it dryenough before addng the brass and that was a mess
i personally would not want media stuck in the flash hole even if its proven to get blown out, i would just change to a finer media, btw i think over 50% of us retumble after size/deprime
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