Is it really worth it to get an extra .45 Colt cylinder? Does it improve accuracy? Cut down on leading in the cylinder? Just dotting Is and crossing Ts?
I've never used a .45 Colt cylinder in my Casulls- instead, if I want to shoot .45 Colt-level loads, I simply download .454 cases to do so. FA publishes a whole list of suitable powders, bullets, etc. to do this.
In fact, nearly all the shooting I do nowdays with .454 Casull is with downloaded .454 cases. Accuracy is just fine, and those cases will last forever at reduced pressure levels. Just don't try using powders like H110 or W296 to do so- they are designed to perform at near max velocity and pressure levels, and reducing loads with these powders can result in misfires.
