Thanks Ruger 450.

You can talk to me directly, guys, I'm in the same room. Ask me directly what I mean.

I don't want to get into a protracted whizzing contest over minutia or definitions...my understanding of a "Paradox" gun is a gun with a smooth bore and a section of rifling so you could shoot both bullets and shot. The ammo wasn't "special", the rifle was. It used shot shells for one type of game and cartridge's with a 740 grain round nose bullet for another.

I have rifled guns in 12 and 20 gauge...shotguns, SS, O/U, pump and auto in 12 and 20 gauge and rifled choke tubes to fit several, and I shoot slugs of some type and weight, factory and home grown, in all of them at various times.

So tell me...by definition...when I install a rifled choke tube on any of those smooth bores, they become a "Paradox Gun" with a capital "P" and when I take off the rifled tube and install a smooth tube and shoot slugs in it along with shot shells it becomes just another ordinary "paradox" gun with a small "p"...and if I were to decide to chuck the rifled gauge gun barrels in my lathe and remove all but 3" of rifling, the gun would become a "True" "Paradox gun". N'est-ce pas?

Or...does it have to be a H&H or one of the other makers of that era to qualify?

There are several mold makers that do large bore bullets. Accurate Arms will make you a single cavity to your specs for $100, so will NEI, Hoch, Brooks, JT, LBT, etc., but they cost quite a bit more.