The Anderson Wheeler press release (I received this I believe back in September in the rush to prepare for my trip and missed posting it):

A New Rifle in MI 6’s Armoury, At her Majesty's Service

Anderson Wheeler of London’s, Mayfair are proud to have supplied one of their fine box lock double express rifles for the defence of the realm in the up and coming James Bond film, ‘Skyfall’.

The rifle is chambered in the mighty 500 Nitro express, built to embody many of the qualities normally associated with the man himself; classic taste and style coupled with a no – nonsense approach to getting the job done.
This rifle is building a reputation as the Professional hunter’s choice, for its reliability, accuracy and overall good looks

The box lock ejector is hand engraved with a traditional Anderson Wheeler house scroll with a coin finish
The open sights are fitted with an integral quarter rib consisting of three folding leaves on the rear sight. The front sight comes with a 4mm ivory bead that can be flipped over the 2mm silver bead under poor light conditions or close quarters.

The hand rubbed, oil finished, stock and forend are made from carefully selected exhibition Turkish walnut, crafted to fit the clients’ personal specifications to ensure balance and a perfect fit.

The thick recoil pad, articulated front trigger and a centralised weighting make this rifle a pleasure to shoot and easy to handle.

The rifle used in the film is a derivative of a round designed in the 1890s. This vintage big game calibre made an unshakable reputation across Africa, particularly throughout the British colonies. Its proper name is the 500, 3 inch, Nitro Express.