How many time has this been discussed? Birdshot blows, don't use it for self-defense. #4 buckshot is the minimum.
You forgot to add 10 gauge 3 1/2" shells 12 pellet 2 1/4 oz loads good for 250 yards. Then if you miss the boogerman you can ventilate the next two neighbors apartments instead of just one.
Or he can use what he is comfortable shooting and hope that the boogerman doesn't want to get shot with any shot shell.
Good intentions will always be pleaded for any assumption of power. The Constitution was made to guard the people against the dangers of good intentions. There are men in all ages who mean to govern will, but they mean to govern. They promise to be good masters, but they mean to be masters.