Bob, I've never liked walnut media unless I had some really grungy range pick up brass. I use exclusively corn cob media, and Rooster Brite polish. I dribble about a capfull in my media (without brass) and run it about 3-5 minutes, them add the brass and let run for 2-3 hours. The walnut always left a finish like it had been bead-blasted with a fine media. I haven't used any now in probably 20+ years.

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H Richard
SWCA1967 SWHF244