I noticed you give your location as "Swamps of Georgia", if your shots will be less than 100yds, you should be good to go without a scope.
In smoothbore slug barrels, I've had good luck with the Winchester Rifled slugs. 12ga, 2 3/4", 1oz at 1600fps, usually good for 2" at 50yd and 4 or 5" at 100yd in my 1100 and 500.
You might try some Remington Buck Hammers, I've heard they are good in smoothbores, and should really put a hurtin' on a hog.