I like carbine/handgun combos. Quite a lot, in fact, though for no practical reasons I can think of off hand.
Mine tend to be pretty strange pairings, like a Swedish 8x58RD rolling block using a .32 H&R chamber converter with one of my revolvers for that chambering.
This single-shot military rifle was originally manufactured by the Carl Gustafs Stads Gevärsfaktori in 1870 for a rimfire black powder cartridge, and then ex...
www.youtube.com
Or my 32-20 Hand Ejector with a Husqvarna single shot bolt action:
My late buddy Scott Amend liked the pairing of his Marlin .444 levergun with his Ruger .44 Magnum Redhawk -- not entirely compatible, but by single loading .44 Magnum rounds and accepting the occasional split case, it worked well enough for him.
My own .45 choices aren't that normal, being mostly .45 Auto Rim in revolvers and .45-70 in my Ruger No.3. They don't share the same bullet diameter, so they really don't have much in common despite the .45 in the cartridge names.
I suppose if I were to pair a .45 rifle and carbine, it would be a 577/450 Martini-Henry with a .45 ACP chamber adapter and some kind of single action.
Maybe with one of my Pietta Remington 1858's with conversion cylinders for .45 Auto Rim!
I could counterbore one of those chamber adapters easily enough for the Auto Rim, and Matt's Bullets offers a .45 HBWC that should be perfect.
Damn, now that idea's firmly stuck in my head!