Try browning.com
Chokes for shotguns shrink the bore's diameter to tighten the shot pattern and increase practical range.
No
Browning's web site has the current information.
Refers to the amount of constriction at the muzzle.
No, Invector chokes will not fit the Browning Medalist shotgun. The Medalist typically uses fixed chokes that are integral to the barrel, while Invector chokes are designed for Browning shotguns with removable choke systems. It's important to check the specific model and choke compatibility for your shotgun.
The Browning web site has a search function that will assist you.
To change the choke of the shot
With standard chokes, Full Choke is the tightest. However, there are non-standard chokes for SOME shotguns (used by turkey hunters) that are Extra Full Choke.
Yes
Not unless it is threaded for them.
Look at the choke tubes.
If not OEM, yes