This is what I remember:
It was in “How the West Was Won”.
I think it was the mini-series and not the tv series.
All I remember from the scene is Bruce Boxleitner is confronting a renown gunman at a saloon (?). Both are seated. Bruce had his gun drawn under the table and the gunman stated that he (the gunman) is SO fast that despite Bruce having the drop on him, the gunman can still outdraw Bruce. I think Bruce states that they’ll both die cause Bruce will get a shot off. so the question is, who is the actor playing “The Gunman”?
I thought it was Robert Culp, but Culp didn’t appear in that show, so I’m probably conflating his character from Hannie Caulder onto the scene.