I'm not sure where the typo happened , but this gun is a .476 WR , not a .470 . Look at the bullet wt Mr. Keith quotes " The 520 grain Cupro Nickel ..." I don't think anyone loaded a 520 bullet for the .470 , (but that was the standard wt. for the .476 WR )?
Robert
(would love to own this gun !!!!!!)