I dont think theres a big diffrence in the 1870s and 1880s stuff but by the 1890s there were lots of improvements in steels the late 1890s anyway. Everyone i sold a SAA colt to is shooting smokeless loads in them all but most are reloading and being carefull some shoot factory ammos to smokeless stuff. Im sure some guys over do it but so far everyone seems to be ok still got all there fingers and eyeballs.

Dont forget theses guns have modern steel cylinders.
The SAA colt cross bolt frames are supose to be better steel in my opion i dont think it matters up here in Canada that much as the cylinders are all pretty much newer modern made cylinders and they do take most of the presure.
As to and original 41 Lc made in 1874 or 1897 i dont think it maters either because your loads wont be that diffrent id shoot smokeless in either gun to specs for that cartridge.
If you get into wildcat cartridges then it might mater but not the original old calibers.
I have a S&WDA in 22 K hornet thats and old 1890s frame made in 1897 and a original cylinder relinded with modern steel inserts and the barrel relined with modern steel liner im gona be playing with in the next few weeks. its alot of fun and this S&W DA has had lotsa 22 K hornet put thru it with no ill effects shes a good tight gun shooting rifle cartridges out to 100 Yds and accurate to for a handgun.
Wildcats are fun but you have to watch the presures and what the steel qualitys are.
I will be posting or starting a thred on the 22 hornet wildcat antique in a month or so as i have a WG target in regular 22 Hornet with its 8 inch target barrel in the works to.
i might get it set up in 22 K hornet as well as its really a better pistoil cartridge.
I want to add i hope this thred dont get way off topic and turn into another mud slinger thred about the ills of smokeless in antiques most reloaders know as long as you are carefull use common sence and reload with some understanding of balistics you wont blow all your fingers off.