I also thought we were discussing the original Henry rifle, not the current Henry rifles. The major reason why .22 rifles don't load through a loading gate in the receiver is two reasons. 1. The cartridges are so small that it's very difficult to load them through a gate without fumbling them or damaging them. They're hard enough to hold onto when loading through a front loading tube or even a box magazine. 2. The major reason is because you're dealing with a .22 RIM FIRE cartridge. The brass rim is thin and soft, get it pinched or hit while loading and they go off in your hand. Notice how most .22 owner's manuals warn about prying around a .22 rim fire while trying to clear a stoppage?