if you want to load smokeless powder in 38 long colt or 32 smith and wesson, all you have to do is
buy a reloading press, appropriate dies, casings, proper bullets,powder measure, and then get a loading manual. id suggest the hodgdon one, simply open the manual to were it says "38 colt" and "32 smith and wesson".
read the powders used, get the powders listed, and reload.
this is a BIG issue with the cartridge conversions on the market. Most people are afraid to use smokeless loads due to "use cowboy ammo only" on the package. The cas ammo reference is merely legal safety for the company making the cartridge conversion because if you say, get a cartridge cylinder for your 1860 colt army or 1851 navy and use ammo sold for ruger blackhawks in it, the cylinder maker is dissolved from any liability for damage to shooter or to firearm because you clearly ignored the warning on the package...
on a side note, its been established for years that the kirst and r&d conversion cylinders are manufactured to meet all SAAMI pressure and chamber standards. otherwise they legaly could not SELL them.
on saami standards, they publish their standards for pressure and dimensions on their website. its a good read. and reloading manuals are legally obligated to stay within SAAMI standards.