Well, since you did specify Carbine, and not rifle, then the aforementioned Ruger .44 Carbine (if you can find one that's not egotistically priced), or what has become one of my favorites...the Universal Vulcan .440. Many have likely not heard of them, since Universal Firearms only completed about 1500 of them from around 1964-67. They were for all intents and purposes a .44 magnum pump action carbine, loosely based on the M1 Carbine. Search it out, they are so cool you might wonder why they aren't re-produced today.