And the arguments go on and on. Accuracy (grouping) performance means nothing inside a house. Larger shot sizes, #2 or #4 (not Buck) game loads will be more than adequate for up-close defense and will not create much of an overpenetration problem, e.g., shooting through walls, ceilings, or floors. I would not recommend anything smaller than #4 shot. A load of #2 or #4 to the chest from 10-15 feet will stop anyone instantly and permanently. My personal choice is #4 Buck. I would never use rifled slugs of any kind for inside-home defense.