That's just one benefit of being at home; you can use whatever you want for home defense! I stick to a handgun with a light. Sixteen rounds of Hornady Critical Duty ammo should do the job, unless a squad breaks down the door. If that happens, I will fall back to my shotgun (a plain vanilla Rem 870 in 12 gauge), loaded with #4 buck. There's just me and the wife in the house, so that reduces my concerns about wall penetration. For a handgun, 9mm is as small as I will go.