I really don't think you could load a .475 bullet in any of your three guns Mack (unless one is a .54). You might look at some of the Speer .458 bullets made for the 45-70. They are excellent bullets and you can shoot them in a .50 with MMP orange sabots, and with regular 50/45 sabots in some guns, depending on how tight the bore is.

Just checked - Graf & Sons is showing the 300 grain Deep Curls in stock. The listing shows the wrong picture, but the bullet number (3974) is correct.
http://www.grafs.com/retail/catalog/...roductId/17309