My experiences with carbines in revolver calibers:
1- Velocity increase with the .357 and 44 Marlins puts the normal 158gr and 240 gr bullets right at 1750fps.
2- Large cavity hollowpoints expand violently at these speeds. The Remington 158gr .357 hollowpoints and Remington 240 gr .44 hollowpoints give me less penetration when fired from a rifle because of this.
3- Leathality is enhanced tremendously with the extra velocity and expansion, penetration is sacrificed.
4-OAL of the carbine aimed is the same as when the revolver is aimed with arms extended. Aim an empty carbine at a wall and ease up to it until the bbl touches, then do the same thing with a revolver. Distance from the wall will be almost identical.
5- The carbine and revolver firing the same ammo made sense 100 years ago and makes sense now.