The TC Custom Shop 28s are pretty nifty. Dave Van Horn also made some 28s. I know that Bullberry made a batch of 32 gauge barrels for Bill Eichelberger. I got to handle one of these but unfortunately it was not for sale. I've had a 9mm rimfire shotgun barrel on my wish list for several years but it has not made it to the top of the list yet. Do the 45/410 and 357 and 44 Hot Shot barrels count? The Hot Shot shot capsules are expensive but you can load your shot shells. A smooth bore 22 shot barrel should be pretty easy to make.
