I don't know if I have enough time right now to fully respond to your post.
I believe the chart refers to a "standard" paradox nitro load @ 1050fps at the muzzle. Paradoxes are prooved for various loadings and the weight of the gun is adjusted accordingly (sometimes). There were 28gr,30gr,33gr,36gr,40gr and 47gr cordite loadings in the 12 bore paradox recorded giving muzzle velocities up to 1475fps with a 730gr conical. If the "magic" of the rifled choke paradox is in the barrels, the brilliance and beauty of the gun is its ability to take any game by merely slipping a different cartridge, lead, lead with copper post, capped or shot, into the chamber; feather or fur, quail to buffalo. Is the smooth bore ball gun really that versatile? I don't know just how far a roundball will travel accurately out of a smooth bore barrel but I would guess that accuracy for the ball declines greatly after 100yds. Holland Wembely notes showed the standard 28gr paradox load to still be accurate at 200yds and the capped conical to 300. I have also heard of 600gr conicals being used which would produce trajectories similar to a round ball but I have yet to substantiate it. If so, wouldn’t you be ballistically better off to use the hollow pointed conical? The Maharajas were great sport hunters, and I do not believe they could be bs’ed easily. Yet they trended away from smooth bore guns after the appearance of the paradox. They must have seen some benefit to the rifled choke system.