I have coated with powder coating paint. I haven't noticed any extra wear anywhere. I also haven't noticed any performance benefits either. I wasn't getting any leading from traditionally lubed cast bullets and was getting great accuracy. With the coated bullets, I get no leading and accuracy was almost as good after adjusting my powder charge.
Powder coating takes too much of my time for little benefit, so I went back to using White Label Lubes carnuba red.
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