After his father passed, my father in law brought back his dad's firearms from Arizona (we live in VA). I was over at his house when he unpacked them. I was admiring his dad's marlin 30 30 from across the room and he brought it over to me and handed it to me. I worked the lever to check the chamber and, sure enough, out popped a round. I worked the action again - another round... basically a whole magazine full.
Rule number one.