From what I have seen here either common calibers like 22 LR, 22 Mag, 223, 44 mag 45-70 and 30-30 sell quickly in the 10-14"
as well a the popular odd ball stuff. 375 JDJ, 7mm TCU. 22 Hornet or an ackley version of 30-30 or 7-30
Personally I think your best bet is to either order a new one the way you want or give your self a list of other candidates you would want like 22LR, 223, or 30-30 and find one of them and then look to buy the barrel you want either through the classifieds here ( I have found 5 here that I wanted at good prices) And if you no longer want the one that came with the frame it would be best to sell it and then buy the one you want rather than trying to trade. I see the trades as taking a whole lot longer than the buy and sell. but you may want to try that route first.