Needs to be checked out by a good gunsmith
Yes it could be done, but you would have to locate a smooth bore barrel to change it with. Remember smooth bore barrels are not as accurate as a rifled bore barrel.
You look down the barrel and if it is swirled it is a rifled barrel and if it is not swirled it is a smooth bore
Smooth-bore refers to a firearm or cannon which does not have a rifled barrel (a rifled barrel is one with ridges that corkscrew down the barrel to impart a spin to the bullet)
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.
The bore is rifled so as to put a spin on the bullet. This spinning gives a greater accuracy to the bullet, especially over that of a smooth bore.
Rifled bore and Smooth bore
Rifled slugs are made of soft lead purposely for use in smooth bore shotguns. Actually the "rifling" on the slug deforms to allow the slug to pass through the choke in the bore. If your firearm is of modern manufacture and in good condition it should be safe. Of course it goes without saying that you must use the appropriate type (i.e 2-3/4", 3", etc.) and gauge (410, 20, 12 etc.) of ammunition for which your firearn was designed. If in doubt, have a reputable gunsmith check it out for you.
It improves that accuracy and distance of the bullet by causing the bullet to spin not tumble like a smooth bore barrel musket.
You can, but I wouldn't advise it.
The difference between the two muskets lies inside the barrel. A smooth-bore barrel is (as the name suggests) smooth inside. As the ball that the gun fires is slightly smaller than the barrel it bounces from side to side as it travels down its length. This causes the possibility that the ball will not exit the barrel traveling straight leading to inaccuracy. A rifled barrel has a groove carved around the inside in a spiral. This catches hold of the ball as it travels down the barrel, holding it on a straight course, and causing it to spin. As it exits the barrel, it is traveling straight and the spin helps to keep it so. In short, a rifled musket is more accurate than a smooth-bore musket and has a longer range.