I am guessing that it is case lube. I load .30 Carbine, and case lube is needed even with carbide dies due to the cases taper. Tumble in walnut shell media with a touch of NuFinish for a good while. I wipe mine off with a damp cloth before I drop them into the tumbler. It cuts the time they need in the tumbler greatly. Spray on lanolin based lube does it the worst. I use Lee Case lube on .30 Carbine, and .45-70 it comes off easier.
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