Agree - .475 No 2 was originally a 480gr bullet and 85gr cordite load;
Jefferey .475NE N0 2 was a 500gr bullet and 80gr cordite load;
and the .457NE was a 480gr bullet and 75gr cordite load.
Would be wise to slug the bore though as I have read that the 475NE can run from .474 to .483 inches - probable also that the other 2 have varying bore sizes?