At about 45:10, Billy sets down the two .45 Long Colt cartridges he removed from Joe Grant's revolver. The fired primer is clearly, albeit briefly, visible in the base of one cartridge as he does so. These were dummy cartridges prepared by an armorer using fired cases. A fresh cartridge would retain an unused primer.
Coffeyville, Kansas has no cliffs around it. The terrain is pretty flat. Also snow capped peaks surrounded by pine forests are all west of Kansas.