my 870 likes Brenneke slugs. Despite what some say, you most likely will not 'destroy a lot of meat'. Hunting lore is full of old wives tales.
Shoot the hog behind the shoulder, or from the front, where the leg meets the body. Your goal is to get that big slug in the boiler room. Should be a one shot kill.
I would prefer the 30/06, but the shottie is good for up close and quick shots.
Nemo Me Impune Lacesset
"The trouble with our liberal friends is not that they're ignorant; it's just that they know so much that isn't so.".........Ronald Reagan