

(Steve McQueen) throughout the duration of the show, chambered in .44-40
(despite the large .45-70 rounds on his belt).
Wikipedia:
Wanted: Dead or Alive – A Western television series starring Steve McQueen as the bounty hunter Josh Randall. It aired on CBS for three seasons from 1958–61. The black-and-white program was a spin-off of a March 1958 episode of Trackdown, a 1957–59 western series starring Robert Culp. The series launched McQueen into becoming the first television star to cross over into comparable status on the big screen.