Back in the '70's(?) there was an article in Gun Digest about the .30 Apache that sounded pretty nice to me, but I never looked into it. Nothing more than a .223 case necked up to take std .308 bullets; a Handi .223 barrel could be rebored and neck reamed/throated maybe less expensively that the stub job?
CW, that 32-20 of your is right up my alley of thinking. Ive been advocating faster twists for classic calibers for years, and sold original twist 32-20 and 25-20 rifles because I could not shoot longer heavies. My custom stub 25-35 does light to heavy .25cal. bullets very well, and so should yours in .30ish.
26t, IM LIKIN' THAT!