Don't count on it being a 1:9" the last word was H&R switched back to 1:12", probably cuz the 1:9" doesn't shoot heavier bullets any better than the 1:12", maybe worse from most reports here.
Ultra and Handi frames are identical, the only difference is the stock and scope rail. You can have any centerfire barrel fitted to any SB2 frame made since 1999, be it a Handi, Ultra or BC, that H&R makes cept the 10g and 12ga slug gun barrels.
Tim