It would be very interesting to indeed find out whether the rifle would fit to the mount of your two scopes! And make sure to check the serial of the rifle, the document I had sent you today mentions several rifles with fittings for scopes, among them serial G.5724, 2981, V.771 and G.7060 (if I read them correctly). Would be quite a discovery to find out there were two different scope mounts made by Rigby, and finally have the production numbers for those two also.