In a revolver, yes. In a rifle, which will have an actual chamber, I would not recommend it, as the .45 LC would not make the headspace in a .454 Casull chamber.
No, it isn't. You won't get proper headspacing, and the end result could be catastrophic.
4cyl to 8 cyl
100-550 USD
The .454 Casull is a firearm cartridge. It was developed in 1957 by Jack Fullmer and Dick Casull. Wikipedia has some general information about the cartridge. More specific information can be found on firearms websites such as the Firearms Forum and the Firearm Blog.
Depends on whether or not you can handle it. The .454 Casull has caused some problems for firers, who would injure their wrists when firing it, usually due to not having a secure enough hold for the recoil force of the round.
100-500 USD or so
The Legacy / Puma 92 is one of them! http://www.gunblast.com/Paco_Legacy_454.htm
45/70, 460 S&W , 480 Ruger, 454 Casull
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These are pretty rare. I have one as well. Have been looking for a value for a long time? Are you looking to sell the one you have?
they make exceptionally well built hand guns, one of my favorite is the raging bull chambered in 454 casull