And, according to John Taffin, who can be considered an authority on single action sixguns, some of the sixguns used by John Wayne were indeed Great Westerns,
Tis true, but ya' don't understand the movie business...
This was back in the 1950's whe Colt wasn't making Single Actions, but Hy Hunter (AKA Great Western) was. Compared to Colts, which were starting to go for big bucks, A new Great Western was inexpensive, and worked fine for a prop gun. Prop guns were and are, thrown around and abused in all sorts of ways - and the powder used in 5 & 1 blanks will eat out a bore in the blink of an eye. Today a lot of the props are made in Italy - for a very good reason.