Two hours in a ss tumbler. Another thirty minutes in fresh corn tumbler. When you take them out of the ss tumbler you will say " damn these are clean". Then after the additional corn polish you will just be speechless. Not that it matters a lot , but having clean brass is nice. Just like having a nice accurate rifle.
If you want them really bright, run the SS tumbler on a timer for 5 hrs. then lightly touch up the chamfer.
			
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