A hunting shotguns main use is for birds on the fly and rabbits or other small game on the run. Rifle sights do not work in either case. A shotgun is pointed not aimed for such uses.
If the shotgun is used for deer, it is set up like a rifle with sights and possibly a scope, and a rifled barrel and sabots is preferred over a smoothbore and foster type slugs. This is a very poor setup for flying critters.
Barrel length should not matter in a normal hunting application, but I prefer longer barrels over short ones for any flying targets.
Since you don't say what you will be hunting for, it is hard to steer you in the direction of best barrel/gun combination.
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"a shootin' we will go"
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