Humpty & PM,
yes H&H is a way to go, the problem is that the gun's bores have straight rifling from the forcing cone onwards up to three inch from the muzzle.
This is not a problem. This is the description of "Jungle Gun". It was developed as a way to create a ball-and-shot gun while not infringing Fosberry's patent. The patent was for a gun which was rifled only in the choke, and since in Jungle Gun you have rifling which goes all the way in the barrel, there's no infringement of the patent.
Of course, if the contemporary Paradox bullet is greater than the groove (rather than bore) dia. of your gun, it would be not safe to shoot.
A ball-and-shot gun seems to be a good option for hunting big game in the brush, if most shots are under 50 yards, and the longest don't exceed 100.