It's a very doable thing, and I've done it but in a roundabout way. I started with a Winchester 94 Oliver F. Winchester Commemerative that didn't shoot good. I bought an octogon barrel from Brownell's, had a 'smith turn the threads and I chambered it with a reamer from Brownell's and cut the dovetails for the barrel bands and sights. Still shot funky so I sold the receiver and found a pre 64 receiver from a 30-30 and put it together with the above barrel and commemerative wood for a complete rifle. It's starting to shoot good and looks very good with black powder. I had to lengthen the cartridge guides and getting out the right hand side one is a bear; the left side one is accessible through the loading gate. I had to make a right angle screw driver to get in and loosen the screw holding the guide, but once out, the guides were easy to lengthen. Currently shooting a Lyman 265 gr gas check bullet, with the gas check for a wad, and 42 gr of Swiss 1.5 in it and it's doing good. Just got a new mold from Mountain Molds that I designed on their computer program; it's a 250 gr, two lube groove bullet with wide shallow grooves. Hoping to get some 3F Swiss to use with this bullet. Shooting this bullet with 44 and 48 grs of 1.5, a .030 wad and differing compression, it did OK but not as good as the Lyman bullet so far. It doesn't seem to shoot smokeless as well as my Winchester 94 38-55 made in 1896, but still working on it. Hope this helps, good luck.
McLintock