Better shoot them in the eye or you're just going to p___ them off. I wouldn't want to have use deadly force but, if I did I wouldn't want to use anything less than 9mm and then I'd want a couple well placed shots. There are too many people hopped up drugs, etc. that will keep fighting if you don't get in a disabling shot.
We have constitutional carry too but, it doesn't apply to being in a vehicle. In that case it has to be in a factory installed compartment such as glove box, console, or seat/door pouch. We just got constitutional carry a few years ago and they failed to include revisions to the previous laws on possession while in the car. Only way you can carry on your body in a car here is with CCW permit. I keep a 9mm 17+1 handy when I'm home and my carry gun is 9mm 8+1 both loaded with hollow points. I feel much safer at 1000+ FPS.