I know a fellow with a Blackhawk in the caliber. The caliber seems rather useless to me, pathetic even out of a carbine. I really see no use in it other than a companion to a carbine. I love those little M1 Carbines for looks and handiness, but the caliber leaves me flat. There was an outfit some time ago modifying M1 Carbines to some .44 caliber wildcat, maybe like the old automag or something. They were a little high dollar, but would make a dandy woods game gun if they were accurate enough. In 30 carbine, though, I'd look elsewhere. My SKS is fine, though heavy, but at least the caliber is somewhat serious. LOL
Out of a pistol, I've never desired .30 carbine caliber when I can get the same gun in the most versatile .357 magnum. Just doesn't do anything for me, I guess.