FFP,
I am happy with the 32-20 (30-20) carbine barrel. I just wish I had more time to shoot/play with it. I had a 10" Contender barrel, which is why I went with it in the carbine over the 218 bee.
Since it is a .308 bore, I have tried everything up to 150 roundnoses in it, but so far the thing that has shot the best (with limited testing unfortunately) has been the Magtech 71 gr .311 jacketed HP. This thing just cracks when loaded with Lil Gun, 4227, etc. and is surprisingly accurate. Too bad I can't locate any more of these bullets since Midway had them a few years ago.