Bolt actions have a very powerful camming action for primary extraction, and can thus handle high pressures and sticky cases with ease. Not so double rifles. I well remember firing two different double rifles which had been re-barrelled to fire more obtainable calibres, but calibres which generated pressures considerably greater than the original rounds did. Both seemed to work fine - at first - but both seized up on me after a few rounds. Upon opening the action the empty cases, instead of being ejected, merely sat there looking at me. They were stuck in the chambers, and the extraction and ejection mechanism was not powerful enough to shift them. Sometimes closing and opening the action again will put things right, but on one occasion I had to poke the empties out with a cleaning rod.

Mac--
Maybe he was refering to a non rimmed cartridge,like a 458WM etc where the small ejectors couldn't move the hull back??

Bet this dude would be a Double man with any type of continuous exposure and the $$coin to obtain one!!