The short answer is "it depends". Need more information.
Depends on the load and what the maker of the choke/shotgun say.
That will depend on whether the choke tube is rated for steel shot or not.
That will depend on whether the choke tube is rated for steel shot or not.
If it was made to shoot steel shot and has interchangeable chokes.
Most ARE shot from full choke- or even Extra Full Choke.
yes.
No.
No.
As long as the barrel was made after 1950 and does NOT have a full choke, you will be able to shoot steel #2 or smaller.
Only with cylinder and improved cylinder choke tubes.
NOT RECOMMENDED unless you are in a life or death situation.
Depends on the choke. MOST chokes, including full choke, can safely fire slugs. Some makers of adjustable chokes recommend that slugs NOT be fired thru their chokes. A very few chokes, such as the Extra Full chokes used on some turkey guns should not be used for slugs.