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I figured it was the copper in the brass. I sized and trimmed them, and tumbled them in a vibratory with green corncob to get the lube off. The exterior red tinge is all gone, but it can still be seen in the primer pockets and inside the cases.
I've tumbled for shorter periods and the brass came out clean, inside and out, but it was a dull brass. I tumble longer just because I like a bright, shiny, and slippery case. Usually I just do it for overnight but I was otherwise distracted this past week.
Keep an eye for those floating pins!
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"I'm your huckleberry."
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