The Trail Carbine is a "lever action rifle, fed by a tubular magazine, with a King's Gate for loading the magazine". The rounds are stuck through a small door in the side of the receiver (below the ejection port) and live in the smaller tube below the barrel. When you cycle the lever the next round is fed up into the barrel. Commonly, this could just be called a Lever Action. While this is, technically, "breech loading", most non-gun-nuts use that term for any of the simpler mechanisms such as break-action (think of a double-barrel shotgun, same in a rifle). where the round must be loaded into the chamber by hand (as opposed to a magazine) and the fired case must be extracted by manual effort as well. The big difference here is, if you fire the round loaded into a break-action rifle, there's no other rounds waiting in a magazine. You have to load 1, shoot 1, load 1, shoot 1... as opposed to a lever action where you load 6, shoot 6 (or 14, or 10, etc...) A revolver like the .357Mag is, usually, described most easily by calling it a revolver. That implies that the magazine is the rotating cylinder, and that rounds must be loaded one at a time into it. There are many ways to load a revolver's cylinder, but that one term gets you 90% of the way there.