Yours is an ejector, if you open the action all the way, the ejector claw should drop down and allow the rim of the cartridge to go all the way into the chamber, if it is open all the way and the ejector still catches the rim, I would R&R the ejector and clean it good, polishing the ejector housing and claw while it's out, wouldn't hurt to put a BB behind the spring while you're at it. If the action is not quite open all the way, the ejector may or may not drop down. It could also have a missing/broken/weak lifter button spring.
Tim