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I have witnessed a Bushmaster choke on the polymer casings just the same as the lacquer. After about 100 rounds, whenever it got hot it would have a stuck case that required serious effort to clear. The owner would then scrub the chamber spotless (with hardened carbon deposits so big I initially thought the bolt lugs or some other part had broken) and then it would run another 80-100 rounds. Same rifle ran fine with brass.
I don't think the case coating has anything to do with it because I've seen lacquered cases do just the same thing and nobody has ever shown me a case where the lacquer has melted off - not to mention I cannot do it in my own experiments. I'd also add that Hornady uses lacquered steel in their training ammo and seem to have no problems.
I have seen old Wolf gunk up chambers with a red goo; but that was clearly the neck sealant and not lacquer. I wonder if this is the source of the lacquer myth?
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