The Fioster type full bore-daiameter soft lead slugs, and the original style Brennekes can be shot out of ANY factory made choke. They are made of pure, soft lead and will swage down if necessary to go thru the choke. However, such slugs will generally shoot better from more open bores that don't deform the slugs too much as they go thru the choke.

You can certainly shoot sluh=gs of this type in your current barrel. But I would suggest that you need some kind of a rear sight on the gun if you intend to shoot single projectiles out of it. Then you need to test several differnt makes of slugs to see which brand shoots most accurately from your barrel.

If you can afford it, it would be better to get a rifled-bore barrel for the gun, and put a good, low-powered scope on it. Then shoot a good sabot-type slug instead of a big lead one!