I'm sorry to say that the twin of this Westley Richards "Ovundo" double rifle in .400/.350 Rigby was once in my possession. I let it go because there was at the time no source for the 300 grain bullets which were the basis of the cartridge's reputation. The pair belonged to an Indian prince and this rifle was converted to 9.3X74R, a caliber I had never heard of at the time (1975). It is in my mind the supreme example of the W/R side plate drop lock action: