50-500 usd
You will need to call Browning.
100-1000 or more depending on EXACTLY what you have.
Browning never made a model 306
100-450 usd
There are many things to consider. Age, condition, scope... Say $3-600.
Browning will send you an owner's manual for free if you request. Otherwise, ask a gunsmith for help
No such model made by Browning.
A Browning A-500g shotgun in excellent condition is worth about 900 dollars.
Impossible to answer without a detailed description of the Browning you are referring to.
A browning 351MN0117 rifle costs between $500 and $1000.
No such weapon made by Browning.