Try putting a shell in backwards to see if the rim recesses are too small. That seems a not too uncommon issue. If a rim won't nest into the recess you'll have to either ream the recesses or maybe try different hulls as someone else suggested. I have a DH12 that sticks like hell using AA hulls, which are universally out of round, but loves the green Remington STS hulls or any old paper hulls, which are all nice and round and never jam it shut.
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