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If you are re-sizing before tumbling, usingf a waster based case lubricant like RCBS Case lube-2 will solve the problem





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But I never had this before it has only just started and its getting worse, thinking about I did change my lube, as my mate give, me some he had left over, cant remember what it was as finished it, and threw the container 

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Forget the car polish, a squirt of w/up liquid and a 1/4 teaspoon of citric acid crystals (off Ebay) to help soften the water and they'll come out nice and clean.

I de-prime my cases then my larger F/A tumbler takes about 30-45mins to run an initial clean (using 1.5mm steel ball bearings).

That gets the cases more then clean enough to re-size, prep and inspect before a final 30min clean.

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Anyone tried leaving out the pins to avoid peening the chamfer?

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AFAIK, it's the pins that actually do the cleaning.

There might be some cleaning action on the outside of the cases with the brass rubbing against each other but that won't clean the primer pockets or the inside surface of the case.

Deburring and chamfering after wet tumbling solves any peening issues.





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