If you watch the trailer here:
You can see him reloading by throwing full-moon clips in the air, then he reloads by running the gun next to the individual cartridges on his belt and them into the cylinder with his thumb, then he spins the cylinder and quickly drops the cartridges in.
Sigh.
Stephen King is one of my favorite writers, but, man, he sure knows nothing about guns... It's always been like that in all of his books. I humbly volunteer to be his "Arms Consultant." LOL
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This Uberti looks like a good base....
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This Pietta is a firing revolver, and costs less than a Blade Runner Blaster. LOL.
Pietta Model 1858 New Army .44-Caliber Black Powder Revolver : Cabela's