[quote=Humpty Dumpty]PM, a question for you. Do you think that back, say, in 1900 or 1910 all Paradox, Jungle Gun, Colindians were meant to shoot basically the same ammo - meanind, the same 1 3/4 oz conical made for 12 bore rifles, and differing only in powder loads? So that an owner could use factory ammo, and won't be limited to casting own bullets and rolling their own cartridges? And so the intended bullet's diameter for most guns of this kind should also be the same?

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Maybe. But because I know there were various loadings 28,30,33,36, 41 and 47 grains of cordite within just the rifled choke offerings all after 1900, I wouldn't presume all bullets for every system were .735. I would err on the side of caution, start with a .729 or .730 bullet and a light load. A good mold throwing a paradox conical and several sizers would be the ticket.