I love to hunt wild boar and sometimes go with a few friends that use dogs. I would love to remodel an H&R Slug gun to shoot brass cases and paradox/bore type conical or ball. Would this be possible to treat one of these rifles in 20 bore or 12 bore as a paradox type rifle and duplicate similar loads either in smokeless or black powder? I would remodel the stocks and finish of the rifle of course, but thought of it instead of my 28 bore double. It is too old.