I used a slug gun for years in VA when I was stationed there. I had an H/R with the rifled barrel. The best accuracy I found was with the Win slugs firing a saboted 50 Cal bullet. They would group an inch and a half at 100 yards and smacked the heck out of deer. If you can find some I'd suggest seeing if they work in your gun.

You get out of life what you are willing to accept. If you ain't happy, do something about it!