Yes they are. I have two Rugers. One is a .357 Blackhawk that I bought in 1971, and the other a Ruger .357 Bisley Vaquero that I got about two years ago. I shoot them both in SASS events. Fun guns in 158 gr. .38 spl.
I also have a Marlin 1894 Cowboy Competition and a Stoeger 12 ga. sbs Coach Gun for SASS also.