What does happen when a pump gun is "racked" is to alert every criminal within earshot of the presence and whereabouts of the racker-not exactly an effective tactical ploy.
I'm on the team that racking a shotgun does nothing to scare a possible threat, especially a determined attacker.
Though I do store my shotgun with nothing in the chamber, why?
Drop safety.
A lot of older shotguns, and time honored designs aren't drop safe, and I'm not Interested in blowing a hole in my bedroom wall because gravity wanted to be an A hole today, or my pet wanted to knock something over.
As for tactics, my strategy is simple, retreat to my bedroom, make ready my shotgun, call the cops, and loudly announce that I have called the police, tell them I'm armed, and not to come down my back hallway or I will shoot.
My position is definitely known, but they have to come to me in a house they probably don't know, knowing I'm armed, and that the police are on their way.
If they're smart, I lose a TV, and a PS3, both covered under insurance.
If they want to try to do me harm... Well the second guy might rethink the idea.
I'm not a subscriber of the "gotta clear the house in the night squad" even the big dogs bring friends when they do that.
Anyhow yeah 11 rounds should be plenty fine.
If they catch me away from my room... 10 rounds of 27 pellet #4 buck Should amend that(33 rounds of Federal HST if I'm carrying my 9mm around, if not I typically have a slickside shotgun within short reach).