Bronco
Cheyenne,
Wyatt Earp
Bat Masterson
Wagon Train
Sugarfoot
Lawman
Tales of Texas Rangers
Wanted: Dead or Alive (ignore Steve McQueen!)
Yancy Derringer
Tombstone
Tales of Death Valley
Daniel Boone
Davey Crockett.....
on and on and on....
As I wrote above, this list was put together by a committee of metrosexual Gen Xers with no historical perspective or curiosity.
Also for your list though not horse operas.
Gang Busters
Whirly Birds
Sky King (half an oater)
FBI in Peace and War
The shows may have been in B&W but there was little gray
How about Paladin, Have Gun Will Travel with Richard Boone, I loved that show when I was a kid.