See it all the time in the movies. I would just chalk it up to the hollywierd intelligence of the cutting room floor. But then, in hollywierd its more about loading blanks, or which arms are used in case a scene is physically harmful to guns. Remember in Dances with Woves, when "Sgt Bauer" is at the "river crossing ambush", he fights with a remington revolver but emerges downstream to smack "Smiles Alot" with a colt?