Depends on what it is choked and what load you want to shoot.
NO! This is EXTREMELY dangerous!
Not recommended
You risk damaging the barrels if you do.
Not recommended
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.
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.
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.
Requires examination by a good gunsmith.
I see no reason that you cannot.The steel shot sould work fine in your ranger model 120 shotgun.
If Vulcan steel barrel means very old or "Damascus" type twist steel barrels, the answer is an emphatic "NO". You're too young to die, no matter what your current age.