It's a 400-360 2-3/4 Nitro Purdey version.

I do not have a good load for it yet. I recently acquired some bullets of the nominal weight (300 grains) and in about three weeks I will get out to the range with a hand press to load four at a time on the shooting bench and see what works.

Up until recently I had only 285 grain bullets and some mis-information as to loads.