Like all guns, every gun/ammo combo will be different, but you don't necessarily need a rifled barrel. I shoot a Mossberg 500 Turkey Special. With Winchester 3" slugs (not sabot) I get 3 1/2-4" groups at 100 yards with a red-dot scope and IC choke. Not super accurate, but more than enough for deer. But my buddy also has a 500 that won't keep them inside 10" with the same ammo/choke.
You really need to try a bunch of combinations to see what works best in your gun. If you want the best potential accuracy though, I would get a rifled barrel, 2-7x scope, and saboted slugs, but you still will have to try different slugs to see what works best.
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