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I never had any issues. Sized and then ultrasonically cleaned them. Once dry (usually the next day) they were tumbled. I usually did each step over a week. 1 night sizing, USC then the next night...

I used synthetic motor oil. "Bought" a liter from work of synthetic 5w30 and poured a bit into the cap, and dipped the first shell, and then every 10-15th one (whenever the sizing die felt a bit...