I'm sure that we'll see the usual Dragnet fans, but my favorites were shows like Tales of the Texas Rangers, Sheriff of Cochise, and U.S. Marshal. (John Bromfield was the sheriff who became the marshal.) I have no idea who the supporting deputies and Ranger were, but they were good. Think Harry Lauter, Jr. may have been Jace Pearson's fellow Ranger.
Not a cop show, but the shorter guy on Lives of the Bengal Lancers/77th Bengal Lancers? was good. I'd know the actors if I saw their names. Both were officers in a cavalry regiment in colonial India. I think Phil Carey played the tall guy. He was later Phillip Marlowe on a diferent series. Think the other guy was named Warren Something. Stevens?
Of current shows, Joe Mantegna is a standout as Supervisory Spcl. Agent David Rossi on, Criminal Minds. I like him as well or better than Thos. Gibson as SSA Aaron Hotchner. The female agents are also good, but three cast members are implausible and detract from the authenticity of the show.
I was a young kid when those early shows were on, but remember the actors pretty well. I can tell you the guns most used, too.