Hi Alan
If you dont get anybody offing you a secondhand pistol try Gary Bate of Derbyshire Arms he gets them in from India for the reinactors but are proof loaded at Birmingham I have a couple a .62 and .66 they are proofed to 90grains of Swiss #1

I know this will draw comments from at least one of my fellow club members they do hit a target at 20meters with 20 grains of medium BP

Cheers
Nigel