I inherited several revolvers from my father. Calibers suited to CAS but kind of expensive to shoot unless you get set up to reload. I got 32 and 44 wcf, 38-40, 45LC. Most are colt reproductions from Cimmaron and uberti. A Schofield 45 reproduction. A couple Bisley repos. All are nice pistols and very cool. I don’t think I will gear up to reload and shoot the non 45LC guns. Wondering if these are used much. I did get a genuine Colt SAA 45LC from him with a 7in barrel and MoP grips. Made in the 80’s. That is pretty nice.
Do the CAS guys shoot these less common calibers?
I haven’t done any cowboy action shoots, but I’m like you. Would love to try it.
My father cast his own lead bullets. I am also getting all the molds and lead and melting pot. Geez another hobby as I get close to retirement. 
I think once you have the brass , reloading should be really cheap.