That story was made into a Maverick episode.
I would like to read the original story. Where can I find it?
The title of the original short story was “That Packsaddle Affair”, so try looking for it under that name. He wrote it under the pen name “Jim Mayo” for the western pulp magazine Texas Rangers (June 1952).
http://mavericktrails.com/production-stage-west.html
edited to add: You can find it in the short story collection * The Outlaws Of Mesquite* by Louis L’Amour.
Thanks Czarcasm!