I'm looking for any information on the .256 Westley Richards cartridge. A friend picked up a nice Westley Richards single shot chambered for it and is looking for load data, etc.

References like Cartridges of the World don't have anything (at least the editions I have) and a quick internet search brings up a custom Mannlicher Schoenauer chambered for it that was at auction a while back, but that's all I can find.

Any help is appreciated.

Bryndon