No, it should not be fired in older Belgian Brownings.
You MUST call Browning to get a correct answer.
You can, but, you will cause a barrel bulge after a while.
Depends on when it was made.
The only way to know for sure is to contact Browning.
You risk damaging the barrels if you do.
Depends on condition. $400-$1000
ONLY IF YOU WANT TO DAMAGE IT!!!!!!!!!!!!!!!!!!!!! Don't do it.
You will need to contact Browning for a current and correct answer. Try their web site first unde FAQ
Depends on when it was made. Go to Browning.com and ask.
50-500 USD or so
50-1000 usd