“Shotgun. No need for accuracy, just point and spray.”
You couldn’t be more mistaken. A standard spread on a cylinder bore is about one inch per yard. Across a normal living room, you will be talking a 3 to 4 inch pattern. Even down a 20 foot hall you still will only get a 7 inch pattern. You had better point it properly.
Mistake number two is anyone who is conditioned to believe, and fully expecting, the the racking of the slide to cause instant obedience. If you make that poor tactical choice, your -expectation- should be that they will laugh and walk towards you. You better be ready, and point properly.
Some sureno will laugh and come kill you if you are too amazed for a moment that he didn’t flee when you racked it.
More better to be chambered, and fire.
Waiting till you have a target to rack it is a bad time to find out that you had some kind of feed stoppage. They are rare, but do indeed happen.
And yes, 20 Ga,, buckshot.
As opposed to a maximum of 1/2 inch diameter bullet from a handgun. I like the odds of the shotgun pattern.