A friend had the 600 and I only shot it twice once. A couple of other times once only, to show how tough I was. It is the worst kicking rifle I have ever fired, and that includes the .577 and a couple of 8 bores. Weight is around 13lbs and much too light, by about 20 lbs.
The .577 is mine and weighs 10 1/2 lbs and also is a real kicker but not as bad as the 600. I have thought about adding weight but since it is easy to carry and not that bad to shoot standing I think I'll leave it.
I would say the 577 is, maybe, 25% more than a 470.
-------------------- Lovu Zdar
Mick
A Man of Pleasure, Enterprise, Wit and Spirit Rare Books, Big Game Hunting, English Rifles, Fishing, Explosives, Chauvinism, Insensitivity, Public Drunkenness and Sloth, Champion of Lost and Unpopular Causes.