>318 Westley Richards can sometimes be found in double rifles. That reamer for the .318 WR's chamber would make it a .323/.318(330) Westley Richards (or .318/.318(330) Westley Richards ?). Getting all a bit confusing!

I assume though the bore was also opened out to .330.

Interesting if a 8x60S double rilfe was opened up. Why? Bore damaged or shot out?