I tumble with the primers still in. Don’t care about flash holes.
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Use Walnut media, I'd gather medium thickness...
I mix in Mineral Spirits when they don't come out as clean as brand new..
I tumble over night in a Cabelas Tumbler I got for like $50, new.
25 pounds of crushed walnut lasts me about 5 years or more. That cost me $10 a container.
One can of mineral spirits costs $10 and lasts about a year, and I tumble quite a bit.. more than most.
I use to buy Walnut Media in 50 pound bags for $12, but the Grange doesn't carry it anymore, so I had to go with the 25 lb bag for $10
The Cabelas tumbler is quiet and IIRC its made by Frankford Arsenal in Utah. Its a real durable sucker. Sometimes I run it for 12 to 14 hours overnight, for weeks at a time..... Only casualty there is the lid finally cracked all to hell. Contact the manufacture and they replaced it at no charge... I bet the unit is close to, if not over, 10 years old.
Its a cheap investment and pays a lot of dividends.. I run brass a lot longer than most do... but I don't load most of them to max capacity and pressure, so that lengthens their service life dramatically Annealing and tumbling also add to the extension of brass life. And most of my brass is range pick up, so I have no real investment in a lot of that either.
I neck size and bump shoulders back with body dies when required.