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Message: <blockquote data-quote="MoBoost" data-source="post: 1634263" data-attributes="member: 3455">On rimless cartridge you need a spring loaded claw/hook that snaps in the extractor groove and pulls the cartridge out. This system works very well when you have a bolt to attach the hook to. As you can imagine, it's a LOT easier to pull something out with a small hook than to push it out. That's why on break-over action a push bar is used.<img src="https://www.okshooters.com/data/MetaMirrorCache/upload.wikimedia.org_wikipedia_commons_thumb_a_a4_ShotgunAction.JPG_220px_ShotgunAction.JPG" alt="" class="fr-fic fr-dii fr-draggable " style="" />The motion of the bar is parallel to the bore axis, and obviously needs something to push on that protrudes from the surface of the cartridge - rim or belt.Now, they do make doubles in rimless cartridges, extractor bar has a spring loaded hook; they are cool, but are seen as unacceptable liability in dangerous game hunting - last thing you want is fiddling with cartridge stuck in chamber or on the extractor while a freaking man-eater charges you.</blockquote>