Bertram makes a .333 flanged cartridge case that they refer to as a ".333 Nitro Express, flanged. Is this the same as the .333 Jeffrey? I did some looking in "Cartridges of the World" and the .333 Jeffrey is the only one that I can find. If these 2 cartridges are different where can I find someting on the cartridge case that Bertram offers?

Thanks,
Robert