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Tumbling will remove lube, both from the case and from the exposed part of the bullet, where it doesn't serve any useful function.
I don't known if ammo makers tumble brass, but I do know that their ammo with lead bullets that I have bought is completely clean. I wonder how they accomplish that.
I am done using ground walnut for such purposes, because its dust sticks to the bullets. Corn cob media works nicely, but must be segregated as gummed up with lube.
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