Crushed walnut hulls. Last batch was at Petsmart....Lizard Litter!
I use a vibrator type and let it run for ~24 hours. Probably excessive. I clean .38spl, .357mag, .357max, .44spl, .40S&W, .45ACP, .338-08, and .223.
BTB, I clean after I de-prime, resize and bell the case mouth, so I get the primer pocket clean also. Yes, I have to pick litter out of the flash hole, but I think it's worth it. Also, give me an extra inspection step. Of course, I'm not a high volume shooter (<1,000 a month) so it's not a big deal.
I use a Lyman turbo tumbler with walnut &corn cob mix with Dillon Rapid Polish 290, it is an ammonia free case enhancer .I makes the cases smoother and shinier than just using media alone. I believe Midway sales it or you can contact dillon at 800-223-4570. No I don't work for them its just that this stuff works great for me.:twisted:
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