A big Texas howdy to ya there Rockin' and welcome to the CAS forums. I'm somewhat a newb to the forum too, still digging through all the resources it has to offer. On the smokeless vs black powder, the quickest and most commonly accepted method of determining if a SAA is good to go with smokeless is to make sure it doesn't have a black powder frame.
Easiest tipoff on a BP frame is the setscrew that holds the cylinder/base pin in.
A Smokeless frame will have the more common spring-loaded assy that operates side-to-side.
Only caveat I can think of is that some newer guns (clones) built to resemble older BP actually use more modern steels and are fully capable of handling Smokeless. Ask here or contact the manuf if they're still around.
disclaimer: Me, if it's a 1960 or newer clone I'll use smokeless in it.
Again, welcome to the forum!
t