The 4-inch medium revolver is what pops into my brain when I hear the word, "gun". It is the archetype for me. Sadly, at my local range all I ever see are snub .38s and black semiautos. The service-size revolvers are getting less and less popular it seems.
I can guarantee you that any range where I am on the line will have a 4" .357 shot on it that day-MINE