Don't overlook the issue - it was raised above.....about ammo being part of the issue...!!!
Try some shells with a good brass base vs alloy or steel ( like a lot of the cheaper promotional shells seem to have). My buddy had an issue with Rio's in his Over Under a couple of weeks ago ...hard to chamber / hard to remove...there was a slight bulge in the steel cup - right near the shoulder of the base. We found about half the shells in a box had the issue.../ his gun was 100% when he went back to the clubhouse and bought a box of Remington STS.
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