Mine is a Mossberg 500 with 6 shot/00 Buck/Slug/00 Buck/Slug/00 Buck. I have a small 2 bedroom home. The longest unobstructed shot is 26 feet. (farthest point in DR to Front Door) At combat range, #6 shot will grind hamburger.
Rick....#4 buck should be your inside the house AP round. Have slugs and 0 or OO buck for when you have to shoot through your own walls or car doors.