COR, what you speak of IS reality. If given the choice I would not have engaged in my first encounter with a hand gun. After living thru that one, I CERTAINLY would have not taken on TWO opponents with a handgun given the choice on the second. One must put philosophy aside, and go for REALITY. Carry what you are willing to stake your life on, REGARDLESS of your enviorment.
A shotgun will go far in winning a fight, and FORGET THE MYTH that bad guys will CRINGE AND WILT at the mere sound of th pump shotgun. This is HOGWASH, some will not, and I have PERSONALLY met a few.
When you pull that pistol, shotgun, or rifle, I was damn willing to use it, as experience has taught me that some will force you to, just to see if you will. Mortality is not as important, or perhaps realized by some. This is always a consideration.
Planning for a self-defense situation is pointless, outside your home. It will come unexpected, suddenly, and most of the time no warning. Practice, training, and mind set, is what will win the fight, if it can be won. Caliber, and bullet brand, WILL BE SECONDARY, but some are better than others in this respect.