Does anyone have loading information for 12 Bore Westley Richards "The Explora" Paradox Gun ? Also case dimensions so I can turn up some cases to use or where a source of cases can be found ?

Westley Richards in England could not really help with much more that the manufactured date of 1906 for the gun. They told me from the serial number it was 12 bore and Nitro Proofed. Under the barrels there is reference also to Cordite 730 ??