Longer barrels help with a smooth swing on moving targets like duck's. a slug gun designed for deer hunting is aimed like a rifle. The longer barrel offers no advantage and is in fact in the way. Most deer hunting rifles have barrels ranging from 20-24". There is no reason for a shotgun barrrel to be any longer.
Any velocity gains beyond around 20" of shotgun barrel are minimal. No deer will ever notice the difference.
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