I have had this problem with my 870. When I would chamber a round, sometimes the next shell in the magazine would slide past the stops and lodge itself under the bolt. It seemed impossible sometimes to get the shell out of there - I'd have to take my knife and push the shell back up the magazine so I could work the action. Sometimes the next shell would do the same thing.
When the problem aggravated me to the point of insanity, I decided it was time to do something about it. I had recently replaced my magazine extension, so I suspected it was the culprit. I put the old mag back on, and I couldn't get the shells to do the same thing.
I compared the magazine springs. The stock spring was about 6" longer than the stock magazine setup. The extended spring was about 16" longer than the extended magazine setup. I cut the spring down to where it was 6" longer than the tube, and I haven't had the problem since.
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Right turn, Clyde.
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