I think Stainless is a great idea for a BP revolver. Not necessary if you clean your guns well and often but I've had one barrel develop rust pitting along the edges of the rifling when I had to leave it in storage for several months after having done a less than through job on the bore.
Stainless can be soft or too brittle for that matter, but the main problems with stainless is galling of the moving parts even when lubricated. To avoid this the parts that come into contact should be of different alloys.
The main problems with Stainless BP repros has been the use of cutting heads with the wrong angles. Stainless requires a diferent angle of bite than carbon steel.
Some manufacturers used old near worn out tooling reground to cut stainless.
Results were mixed at best.
Also stainless isn't entirely stainless just highly corrosion resistent.
I've seen S&W stainless steel revolvers that were deeply discolored after many years of neglect.
PS
Pop always said that I should never buy a plated pistol, because the manufacturers would used those parts that had been turned down due to visible flaws and self leveling nickle would hide those flaws. He was right, I've had a couple of plated pistols that had hidden flaws.
