I know what kind of gun it is. One of the problems with that action is that it has zero seating or primary extraction power. In a bolt action, the closing downward movement of the bolt handle exerts a powerful force on the cartridge through the seating cam. That power is absent on that break open gun, so any small dimensional problem will prevent the action from closing.
There is also no primary extraction power except the ejector spring, so anything that prevents smooth extraction/ejection (like a dirty case) will require use of a cleaning rod.
Jim
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