I've shot several 40's. They strike me as an intnese, loud, high pressure round. I understand they go critical easily when reloaded as well. For some reason more critical and not as accurate as the 10.
The .38-40, however, was a much nicer, quieter round getting the same ballistics w/o nearly the fuss. Should be easy to for in a modern Ruger. Lately I've seen winchester brass for sale in Cabela's new catalog.
Sorely tempted guys. Now, if my account will tell me how badly my taxes came out..... E