Depends on what it is choked and what load you want to shoot.
Not recommended
You risk damaging the barrels if you do.
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
Depends on the load and what the maker of the choke/shotgun say.
Depends on when it was made. Go to Browning.com and ask.
Depends on how old it is. Have it checked over by a good gunsmith
with the wingmaster barrel you can only shoot lead, but if you change the barrel to a slugster you can shoot slugs and buckshot, they also have a barrel for steel shot to.
I see no reason that you cannot.The steel shot sould work fine in your ranger model 120 shotgun.
If it was made to shoot steel shot and has interchangeable chokes.
Requires examination by a good gunsmith.
NO!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Do not shoot steel shot in this weapon.