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.
That Redhawk is 45LC. I got it to go with my Puma 454 (also shoots the 45LC).
I use full power hand loads (1050 fps) and even some old Elmer Kieth loads that hit around 1500fps from the 5.5 barrel and around 1800 fps from the Puma. These are pushing 260 grain RNFPGC.
The Puma is 18 inch ported and makes quite a ‘boom’. LOTS of fun at the range.