Green Frog
Member
Congrats on a fun find. I have a 6” Model 32-20 M&P a little earlier than yours (by only about 5 years or so) and a kind member of this forum gifted me a FDL Wondersight (Firearms Development Lab). When I last checked they were still in business with a website and everything. Other than a slight tendency to drag on stuff, the FDLWS is just about as good as the period factory target sight and you may find it to be somewhat more easily adjusted. The blade is easier on my tired old eyes! 
As for ammo in 32 WCF, I would go to the various websites that cater to the CAS (Cowboy Action Shooting) and SASS (Single Action Shooting Society) crowds and see what a search in their vendor section brings to light. Since a lot of their events have been curtailed due to Wu Flu, maybe the suppliers of this somewhat esoteric round will have caught up with demand.
Enjoy!
Froggie

As for ammo in 32 WCF, I would go to the various websites that cater to the CAS (Cowboy Action Shooting) and SASS (Single Action Shooting Society) crowds and see what a search in their vendor section brings to light. Since a lot of their events have been curtailed due to Wu Flu, maybe the suppliers of this somewhat esoteric round will have caught up with demand.

Enjoy!
Froggie