It works fine. Go shoot some paper and see how accurate it will be for you and from how far. Some guys can shoot some smoothbore slug guns 30 yards accurately; some can shoot 100. I assume you don't have changeable choke tubes. If you do, I'd replace that modified with improved cylinder.
i shoot a smooth bore as well. Go get your self some Berneke KO's they are a rifled slug. Then what i did was bought one of the clip on sights, they clip on the guide rail on your gun. I put the gun in my shoulder just how i would when i shoot and then i had my dad clip the sight on the rail and adjust it so that it would cover the whole bb at the end of the barrel. I did this so that when i put the gun up in the woods i know that i was in the correct position. I shot a buck last year at about 50yrds and he never even took a step