What world do you live in that a burglar is so determined and self-defense conflicts last so long that you would NEED more shots than a pistol, OR have time to "get back to your shotgun or rifle"?

Pull a gun and take a shot on a home invader and they're taking off. This isn't the movies where storm troopers in full tactical gear invade your home with automatic weapons...

And personally, based on my experience, a handgun is FAR superior to both shotguns and rifles in self-defense/home invasion situations, especially in urban environments.