Check the Double Rifle Forum. Nitro has just bought a Greener to do the same thing to.
The idea of a 416 Rigby is a poor one as the rimless case and high pressure (compared to a Double Rifle Cartridge) are not suited to a break action rifle. I suggest a 400 Jeffery or maybe a 450 of some sort.
-------------------- 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.