Where did you get the idea that Eastwood didn't pull the cylinder pin? On a Remington style cap & ball revolver the cylinder pin is retained by the loading lever, drop the lever and pull the pin. Watch the movie again and you'll see he does that. That is a slightly faster way to reload a cap & ball revolver but with cartridges I think you'd loose more time fighting with spilled cartridges than you'd gain. What you really need is a double action revolver with speed loaders.