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Go to Remington.com and download an owner's manual. most modern choke tubes have some type of marking that will allow you to determine the choke without removing it from the barrel. some use a notch system while others have stars.
The smallest type of seal is the Baikal seal.
A skeet choke which is 5 notches
# They relate to choke type, i.e., full, modified....
the store brand and gauge for starters.
Rifles, shotguns and handguns differ mostly on the type of cartridge used.
Electric.
Browning did not make an Invector model. That is the type choke system of the shotgun.
Most of the chokes on this type carb are basic spring loaded designs and are really meant to insure at pull start speed the system draws enough fuel to start.
An ideal choke coil has only inductance. It has zero resistance and no stray capacitance, therefore no resonances.
The deciding factors will depend on your skill level, comfort with the operating system, how much you want to spend and type of shooting you will do.
Go to Browning.com and type "Invector Choke" in the search function.