You're supposed to start with your rings set to heavy, and no lube whatsoever on the mag tube...If light loads cycle, leave it alone...If they do not, then go to the light load setting of the rings...If it still will not cycle reliably, then Browning used to recommend straight 30 weight non-detergent oil sparingly on the mag tube...
None of this explains why it will not lift a shell with the bolt locked back when the button depressed...
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