You wont get any accuracy at all with a sabot out of a smooth bore. With full bore slugs the fins on the slug are angled to give it some spin. Not nearly as much that is really needed but the Brennekey slugs are engineered for smooth bore shooting. Those fins also collapse under the pressure to go through your bore. But a full choke will cause a lot of stress on the end of your barrel. Your barrel may or may not get damaged, more than likely not, but it still isn't a recommendation I would make. Just from a safety point of view. As far as accuracy goes, the old man had an old Charles Daly field gun smooth bore that he screwed a modified choke on for punkin balls. Out to 75 yards he could easily keep it in around 7 inches. Not too bad of accuracy for what it was. He dropped quite a few deer with that setup. All I can tell you is give a box of Brennekey's a try. If you don't broom the muzzle of your barrel then you should be fine. As far as accuracy goes, that's going to be a coin toss really.