Well, the nice thing is that just as you can shoot a .38 special from a .357, you can shoot a .45LC through a .454 Casull. Although I'm not 100% sure that's recommended in the Freedom Arms revolvers, due to the extremely tight tolerances (I could be completely wrong, though).
A fun little prank to pull is load up a cylinder of light load .45LC, and then let someone take a few shots... Slip in a full bore .454 Casull with their cylinder! :-)
Mark
The problem with .45 Colt in a .454 Casull FA is that the lead residue that builds up in the chambers from the .45 Colt can create pressure problems unless it is all cleaned out before firing .454. (If you don't believe me, refer all flames to John Taffin.)
"A fun little prank to pull is load up a cylinder of light load .45LC, and then let someone take a few shots... Slip in a full bore .454 Casull with their cylinder! :-)
Hey Pard, I'm not trying to be ugly with a fellow shooter, but I highly recommend against "suprising" your friends with a .454 load. At best, it could result in a dropped gun. At worst, it could be lethal. If I recall, (and someone here will correct me if I'm wrong) a 12-yr-old boy was killed here in Texas about a year ago when his Dad (or Uncle?) let him try shooting the Casull. The kiddo fired, and the gun recoiled back and hit him snack in the forehead. And I believe it killed him. Jeez, I have my 10-yr-old son shooting cowboy action with me. I just can't imagine the grief. What a horrible tragedy.