To answer your original question. From the picture the rifle appears to be a No.1B model. This is supported by the full forend, standard rib and what appears to be a magnum sporter weight barrel. The cartridge it is chambered in pretty much confirms this to be a No.1B.
With a 26in barrel it is well suited to being a 300 Weatherby. To tame recoil, a 1in Limbsaver recoil pad would help significantly - go with the grind to fit version as the No.1 woodwork is not as consistent as it could be and the pre-fit pads often look out of place.
