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Firing .45 Colt in .454 Casull leaves carbon build up in the chamber just past the mouth of the .45 Colt cartridge. If this is not cleaned well before firing the longer .454 Casull then chamber pressures skyrocket on an already very high pressure cartridge. This can lead to unpleasant results to rifle and shooter.
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Indeed I think that's the case with firing .38s out of a .357 lever action as well. In my case, my Win 94 does not like to shoot .357s after shooting .38s (learned the hard way) so I don't do it. If I start with a clean brushed chamber I'll shoot .357s before I switch to .38s and I plan to follow the same procedure with my .454.
But your point about reloading is well taken and that's what I had planned to do but I've noticed that .454 brass is something like 70% more expensive than .45 Colt brass. Sheesh! Provided mine feeds .45 Colt well I think I'll just stick to the Colts and buy .454 if I need it for hunting (and clean my chamber real well).
Best,
Oly