Hi Patrick,
I must have been asleep and missed this one. Your results will depend on carefully matching your "parts." As Abilene noted, Uberti doesn't do a "convertible" in .44 the same way they do .45 Colt.
When you make this change, you may want to consider when the base handgun was made. Some of the "older" guns have a 427/428 Bore. The newer build guns have a nominal 429/430 bore. First step will be to slug the bore so you can match the cylinder throats
to the bore diameter. You will want the throat and bullet diameter to be around .0005 larger than the bore.
If your matching to a rifle as well, many 427/428 bore rifle's chambers will not accept ammo loaded with .430 bullets. Just a thought.
for the most part, with careful selection/fitting of parts, a 44 Special/44-40 convertible can be a lot of fun.
Coffinmaker