Any non rifled slug. However for best perfomance you want a "saboted" slug.
You can, but, it will not be a good thing.
no
Yes, but, the results will be dismal at best.
Yes. That's the only type of shotgun you should fire a sabot slug from. Rifled shotguns are intended for rifled slugs only. Actually, the opposite is true. Rifled slugs are preferred for smooth barreled shotguns. The 'rifling' on the slug is actually just fins that permit the slug to squeeze through the choke on the shotgun barrel. Sabot slugs are intended for rifled barrels, as they will give better accuracy. Some sabots may be used in smooth barrels, but you are paying more for sabots and not getting the accuracy you would get by using a sabot in a rifled barrel.
Slugs. You CAN shoot lead bird shot in a rifled barrel but it will not give you good or consistant patterns.
no slugs should on be shot thru a improved cylinder shotgun. if you shoot thru any other choke it can cause the barrel to split
yes.
Shooting rifled slugs is the ONLY way to shoot thru a smoothbore for deer. If you shoot sabot slugs thru a smoothbore, it will not spin and therefore not be accurate. For accuracy, the slug must spin out of the barrel. Either shoot a rifled slug thru a smooth barrel, or shoot a saboted slug thru a rifled barrel.
a slug is normally use in a shot gun and they are not rifled a gun with a rifled barrel should shoot a Shell that is the same caliber as the gun.
probably not, historicly shotguns are smoothbore if you shoot a slug, THAT would be rifled.
Depends on the ammunition. Rifled 12 gauge slugs are accurate to about 150 yards
A shotgun typically has a smooth bore and is designed to shoot multiple pellets or a single slug, while a rifle has a rifled barrel and is designed to shoot a single projectile with accuracy over longer distances.