00bk is the world standard for home defence & cqb. Another good option is 3" high velocity bb shells. Ass tons of pellets, still plenty large enough to kill & more pellets than buck shot. I would recomend the HV bb shot at 20 yards plus though, 00bk is still the best cqb load, use magnum loads if you have the sholder for it. Also,look up Winchester pdx1-12. Is 1 hollowpoint rifles slug with 3, 00bk shot on top. Another option from the pdxq-12 line is a fragmenting slug, I doubt it's as effective though.