470:

bonanza is correct, my dad, Doc52, and I are having Butch build us a .577. We already have a .500 NE DR and numerous other caliber rifles in the .400 class, so we went bigger.

Butch is a great guy and in my opinion makes a hell of a rifle.

Do a search on here and check out what everyone says about buying an older double - if you don't know what you're looking for you can get seriously burned if you don't take the proper steps.

But, back to your original post, I would go with the .500 NE. The .470 will kill anything on the planet, but the .500 has that little bit more should you need it.

The .577 is way too big to start with if you don't already have a heavy DR in your safe.

Just my opinions...