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 stiff I dipped another case). If you dip every case you will end up putting dents in the shoulder. The oil would have cost me about $10 retail, and will probably last you a great number of years.
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