Keep in mind that these cartridges BOTH operate at fairly high chamber pressures, so it might not be a good idea to shoot alot of .480 through it if you want to shoot .475's also. You could end up with a ring in the chamber. It's not the exact same thing as loading low pressure 38/44 Specials in the beavier .357/44 Magnum wheelgun or rifle. This might or might not cause problems, but it is something for you to consider.
From my point of view on this matter, once you've got some brass it should last a long time unless loaded to full pressure at all times, so why not use the Linebaugh casing.