This is a failure to extract, not a failure to eject. This matters because the causes of each can be quite different.
Since the case remains in the chamber after the round is fired I would assume the extractor is slipping off the rim of the case. If the case comes out easily with a finger nail or tool, I would rule out a tight chamber.
In my opinion the cause is likely a faulty extractor or insufficient extractor tension.
Since the case remains in the chamber after the round is fired I would assume the extractor is slipping off the rim of the case. If the case comes out easily with a finger nail or tool, I would rule out a tight chamber.
In my opinion the cause is likely a faulty extractor or insufficient extractor tension.

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