454. Since the majority of people don't live next to or near a bullet manufacturer, the 45's are a store away and the 475' are in the order form.
Not necessarily. Not all 45 caliber bullets can handle the pressure of a 454. In my experience, if I can find .452" bullets that can be fired out of the 454/460, the store will likely also have .475" bullets on the shelf.
Then again, I often just order from Midway or Cabelas. Much more reliable about keeping what you want in stock, IMO.
