Want this question answered?
Yes
yes.
Any non rifled slug. However for best perfomance you want a "saboted" slug.
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.
Can you shoot a standard slug threw a modified and or improved?
no
As long as the maker doesn't caution against it. Have it checked out by a gunsmith
head
Slugs will shoot safely through any choke but Improved cylinder or full cylinder should work.
A rifled slug- yes.
As long as the owner's manual doesn't prohibit it.
NOPE. with out rifling, be it barrel or slug itself, there would be no spin on the slug. You would have minimal accuracy.