I believe that PC will be more resilient in purging blue lube than the other way around. I would test one medium, clean even if only a few patches to see if leading is present then shoot the other. For target shooting I have seen that it can take as many as 15-25 shots to purge a lube and season a barrel to the newer lube. I feel, though have no proof, that traditional lube would be helped by this more than powder coating.
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Front sight and squeeze
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