I can't think of a single sane reason to do so, but I got a bit of an itch.
Everything I've read says the .38-40 is a little PITA to get just right for a levergun, and if you get it right for that, it won't want to play nice in a wheel gun.
So, I keep throwing cold water at that squeaky little voice in my head. Nothing like cold, hard experiences of others to quench an itch!! Right???
There is something about that oddball thing that gets my goat. Don't know if it is the funny neck down, the circumstances that make a ".38" really .401, or the question of why it showed up at all, being so close in size to the actual size of the .44-40!!
It makes no sense at all and I guess that just jacks up the curiosity enough to make me listen to that darned voice.
It's just nuts. Right?!