Okay, I don't have a book of cartridge dimensions, so I'm asking here.

Is the 333 Jeffery a unique case or is it based on the 404 Jeff? What about the 280 Jeffery?

Same question for the 350 Rigby, is it a unique case or based on the 416 Rigby?

Also, John Taylor makes mention of the 280 Halgar, but I can't find references to this cartridge anywhere else. Anyone know the history behind this round or is case specs?

Dumb questions, but am curious.