I hunted with a guy who used a Heym Express in .416 Rigby in Oz. He took 6 Bull Buffalo with it and I must say it was one of the nicest modern rifles I have seen. It was also very nicely balanced and comfortable to shoot. It looked to be designed for a guy to carry all day. Nice lines and good weight. When I am in the market for a new hunting rifle that is the one. Would also be more than happy to have one in 458 Lott. I don't know alot about velocity and energy figures but I appreciate the way those 458s hit. From my perspective there is a noticeable step up to the mid 40s.