Across The Rio Grande (1949)

Outlaws attempting to kidnap Steve Blaine from a stagecoach are ran off by the sharpshooting of his sister, Sally and rescuers Jimmy Wakely and Cannonball Taylor. Steve is investigating his father's sudden death after charges of theft from the Sloan/Carson mine. Sloan is killed after Wakely learns that ore is being smuggled across the Mexican border into the mine, and then sold at the higher U.S. prices

Unfortunately the movie Across The Rio Grande is not yet available on HBO Max.