"John Wesley Hardin"

In "John Wesley Hardin" someone hires John Wesley Hardin to kill Hardie before he can testify.

Hardin claims that he never drew first in any of his gunfights - which makes the later men who drew on him seem really foolish considering that he has the reputation of having killed 35 men by the time of the episodes.

At the end Hardie's narration says that 15 months after the episode Hardin did draw first on a man and the Texas Rangers arrested him in Penascola, Florida, Hardin served 17 years in prison, and became a lawyer after his release.

John Wesley Hardin killed Deputy Sheriff Charles Webb of Brown County, Texas on May 26, 1874, and was arrested for it in Penascola, Florida, in 1877. Hardin was released after 17 years in 1894 and did become a lawyer.

So the fictional date of "John Wesley Hardin" should be sometime between January 27, 1873 and February 26, 1873. If one assumes that John Wesley Hardin's career in Tales of Wells Fargo was similar enough to his real career.