I prefer a triple tap directly. Don't need to even aim for the head. Maybe even quad tap. The fifth one, if needed would be point blank to make sure the threat really has stopped and won't get back up to murder you and leave your family without a father.
If it goes to court, you have self-defense laws. But at least you are alive, and you might be able to attend your son's graduation.
Lol one maybe two bullets is self defense. 5 will get you in trouble.
The average number of rounds fire in a police shooting ... 17.
Responsible gun owners should know the laws related to self defense, castle doctrine, stand your ground, etc in their state.
If you genuinely believe that your situation does not requrie lesthal force then 1 shot is just as wrong as 5. If your situation requires lethal force then it requires lethal force until the target is no longer a threat. That means aim center mass and shoot until target ceases to be a threat, has left the area, or you run out of ammo.
Speaking as an 11 year Army Veteran shooting with a pistol under combat conditions is difficult. Even trained Police Officers rarely hit one in 12 shots. The first thing that happens is you will get a shot of adrenaline likely the largest and most intense dose of adrenaline you will experience in your life. The bad news is this causes peripheral vision to fade, fine motor skills (like aiming and trigger squeeze) to be degraded and a sensation of time operating at a increased speed. Many soldiers in firefights will believe it lasted 10-15 minutes only to find out only find out it was 90 seconds.
It can be very difficult to make an assessment under combat conditions if a target is still a threat (and self defense is combat). If they are still a threat and you hesitate trying to determine if you landed two hits or not it may be the last mistake you make.
Positively identify the threat (make sure the intruder is really an intruder).
Aim center mass (no stupid "shoot him in the leg" nonsense landing body shots is tough enough).
Shoot to stop the threat (continue to engage the target until is no longer a threat).