Wow, everyone got set off pretty quickly by the word overkill. I was actually referring to the cartridge known as the .600 Overkill, because I think I remember Ivan Carter using it. Anyway, if I do get a rimmed cartridge, which one? I like the .450 and .470 rifles, but as a huge Earnest Hemingway fan, I am partial to the .577 NE. I was thinking that maybe a Heym in .500 NE would be the perfect balance between the .470 and the .577, without being ridiculously heavy or high recoil. What do you guys think of this? Is there a reason to take the .450 or .470 rifle or on the other end of the spectrum the .577 NE, or is the .500 a perfect balance? If the .577 was a good choice, I'd buy one in a heartbeat for sheer nostalgiac value. Anyway, I definitely will practice with whichever gun I do end up getting. So, the basic question is, which of these calibers is best for lion and elephant, and from which manufacturer should I get it from. Also, is it better than the P&V .458, because I have handled and shot that gun, and not only does it for me like a glove, but I can handle it very well.