Thanks to everyone for their imput.

Colt was never consistent on how the marked their guns. They called the .44/40 a cal. 44 while they called its companion a .38 w.c.f. They called the .44 Russian a .44 S & W. They also made .44 Russians to chamber the .44 Special, and .38 Specials that chamberd the .357 Magnum.

I agree the .476 is a very scarce gun.