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So - my question is - is this a problem with the lacquered case ammunition? As in - the lacquer is sticking to the inside of the hot chamber?
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Yes. There's probably ancient cosmoline and/or cleaning oil residue inside the chamber. Next time you take it to the range, shoot it until it starts getting hot, then wipe off the inside of the chamber with a small shotgun brush soaked in mineral spirits. A small rag tied to a piece of wood will also work. This procedure can also be done in a warm (180-200 degrees F) oven, but this requires disassembling the rifle and obtaining spousal approval.
It's also possible that you have a burr in the chamber, although this usually causes hard extraction right away, with a cold barrel. Inspect your extracted rounds for scratches. Be aware that the ejector on the receiver wall usually scratches the cases on the way in, so you'll want to hand-feed the test round(s) partway into the chamber.
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Or is it possible that the action on my rifle is too tight? As in, when the metal parts expand with heat, they are causing the bolt to jam?
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It's possible but quite unlikely.