You have a wonderful rifle there. The Fraser single shots are the best of the best!

Is it No.1522?

I have had success regulating a 360 x 2 1/4 BPE double by using 50 grains of Olde Eynsford 2F and a 150 grain paper wrapped bullet. This load would probably shoot very nicely in this little rifle if it has the Fraser ratchet rifling - and be deadly on roebuck!