Almost anything from bacon grease to motor oil will work (thnx AJC1). But one concern is more than how cases are sized, but application, gunking up dies, fingers, hands and removal after sizing. I have used STP for a few things, but I'd never use it for case lube. Once it gets on your fingers it needs a strong solvent or soap and hot water to clean up and same with dies and anything else it touches. Tumbling after sizing would quickly gunk up the media and probably even coat the drum ID. Most other petroleum products will be similar, but not as difficult as STP. (Vaseline, Bag Balm, Motor oil etc.).
A bunch of years ago I was in a Walgreens and in the shoe care dept. I saw a can of Mink Oil Boot Dressing Cream and remembered I read somewhere it makes a good case lube. Bought it, tried it and 30 years later I have not had a stuck case and clean up is easy, most of the time just a quick wipe with a paper towel during after sizing inspection. The only lube I tried that seemed better was the alcohol/pure lanolin mix. But it's so much easier to open a small jar, than mix up a batch for spraying...
A bunch of years ago I was in a Walgreens and in the shoe care dept. I saw a can of Mink Oil Boot Dressing Cream and remembered I read somewhere it makes a good case lube. Bought it, tried it and 30 years later I have not had a stuck case and clean up is easy, most of the time just a quick wipe with a paper towel during after sizing inspection. The only lube I tried that seemed better was the alcohol/pure lanolin mix. But it's so much easier to open a small jar, than mix up a batch for spraying...
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