I have a .375 H&H Whitworth that I would like to have rebarreled, or rebored and reworked into a .416 Taylor or .404 Jeffery. Has anyone done this conversion on a Whitworth or like action that was originally "lengthened" by the factory? Which caliber would be better considering the action and length? I do not want to convert it to a .458 Lott or .416 Remington and am only interested in the above two calibers with specific "quarry" in mind. Thanks, Riley