Depends on when it was made. Go to Browning.com and ask.
No, due to the damage steel does to the barrels. Not recommended by Browning
Depends on when it was made.
You MUST call Browning to get a correct answer.
Not recommended
Depends on what it is choked and what load you want to shoot.
Identifies the barrel as suitable for modern loads.
Yes. Lead shot may be safely fired from a shotgun that is made for steel shot. Problems arise when you fire steel shot from an older shotgun that is made for lead shot only- the barrel is softer metal, and make be scratched by the steel shot.
Not recommended
ONLY IF YOU WANT TO DAMAGE IT!!!!!!!!!!!!!!!!!!!!! Don't do it.
Depends on the load and what the maker of the choke/shotgun say.
Try online auctions.