John,

Having brought back this thread from 2010, it might be wise to point out to newcomers that Peter is no longer in the gunmaking business (if ever he was), and exited rather un-gracefully.

As for this 6x70mm Rimmed cartridge, it never caught on. If you want to go for a hot 6mm flanged cartridge, why not consider the .240 H&H Flanged Magnum? That's a real cartridge, and Bertram makes brass for it.

Holland & Holland should be able to spin one out for you. They probably haven't had one come off their bench since the 1940s, but what the heck?

Curl