Jim,
Another question...I have come by a Rice barrel - 42 inch, swamped, .54 cal, round bottom rifling, Golden age / York profile, "C" weight (breech is 1.070" and waist is 0.820"). Not quite as long or as swamped as your rifle. I have an option to buy a Rice 44 inch, swamped, .54 cal, round bottom rifling, Lancaster / Dickert profile, "C" weight (breech is 1.062" and waist is 0.794"). I would think the latter is a closer match to the barrel you used, but I thought I would ask your opinion.
Thanks
Dave C