Just as I stated in my previous post, I do knot own a 460, so can only rely on secondhand information. The figures I gave were simply what was revealed in a very quick Google search.
As for what your load and gun do in comparison with the load I quoted, you gain about a 4" advantage in trajectory and about 500 lb ft of energy, a much bigger gain in terminal energy at the 200 yard mark. Thus my preference for heavy for caliber bullets.
I like how you casually say it has about 500 lb ft more energy