470: Are you talking about the Pedersoli Kodiak in .72? Haven't hunted anything but bullseyes with the one I had a few years back, but have a new one on order. I think piggies would be about perfect with a very modest round ball load, assuming it regulates in your gun. The Kodiaks can take considerabley more steam, though --close to what the fellas had available circa 1850 -- and something like 130 grains FFg under an 835-grain conical is a breeze.