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It looks like one factor is how much room there is in the magazine. In order for this to work, after fully loading the magazine, there must be enough room left for the "ghost" shell to partially enter the magazine when you close the breech.
Perhaps other designs don't need that last shell to enter the magazine. One would have to analyze each shotgun, including different magazine configurations.
Perhaps other designs don't need that last shell to enter the magazine. One would have to analyze each shotgun, including different magazine configurations.