If the action reliably and consistently locks open by hand with the magazine empty, then it might be safe to assume that the basic mechanisms are in correct working order. In that instance, I would put a drop or two of oil on the magazine tube and ensure that the rings are set up with the bevelled steel insert on the rear/receiver end of the spring, just to make sure that the action isn't short-stroking. Getting the rings set up correctly is important, but so is making sure that the tube has a thin film of lube on it.
If it had a true ejection/extraction issue, then it would try to re-feed the spent hull on every round (and lock up the action as the subsequent round was lifted up into the spent hull).
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