HansGruber
Ronin
Right; a couple of myths being repeated, here:Home invasion is not a crime perpetrated by smart mentally competent individuals. It's a high risk, low reward act. Much easier and safer to knock over a bank. They'll give up the cash readily and won't try to shoot you. As long as you have a solid escape plan, maybe using an easily stolen Kia, you stand a good chance of avoiding apprehension.
Deterrence is always better than having to actively repond and the best deterrence is probably some motion activated outdoor lighting and a large dog with a convincing bark. The dog will hear the perps long before they'd awaken you and the barking of the dog will alert you to the need to dial 911 at once as well as to prepare to resist as needed.
That said, I personally favor a twelve gauge for household defense. Lots of kick, but easy to hit a target with at least a part of the pattern and you won't have rounds penetrating through walls and maybe hitting someone in your family or the neighbor's house.
First, pattern; at typical in the house distances—30 feet at the high end—your pattern isn’t going to be very big; maybe the size of the palm of your hand, smaller with some shot (see the pics earlier in this thread of the Federal Flight Control making one big hole in the target)…but it’s not going to be a huge pattern. It’ll be plenty easy to miss the target entirely.
Second: if you’re using a load that’s going to be effective at getting a rapid stop—that is, buckshot—it’s going to go through walls, plural. In fact, 00 buck has been shown to go through just as many walls as a 9mm FMJ. So, Rule 4 still applies—it ALWAYS applies.