" I want to shoot black powder because of the era into which this revolver fits."

That is not actually correct. While black powder cartridge loadings were available and used well into the early 20th Century, UMC offered a fairly full line of smokeless powder handgun cartridges starting in 1894. Smokeless powder was being manufactured by duPont in 1892-93, and there was some use of European-manufactured smokeless powder in the USA even earlier. One can argue that the smokeless powder era began well before the Model of 1899 revolver was first marketed.