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I've used the same Lee products to reload many thousands of 9mm rounds with zero issues. No lube is required during the case belling/powder charging stage. In fact, no lube was ever required even while using the carbide sizing die. I did use a bit of NuCar polish in the tumbling media and maybe that was all the slick required.
Anyway... as to your issue. It sounds like a cartridge brand specific issue. Have you noticed if the problem occurs with only a certain manufacturer's brass?
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