Coyote,
If you have to actually use a firearm in self defense, you WILL find yourself in court. First the shooting may go to a grand jury, probably made up of non gun folks or anti gun folks.
Even if it doesn't go to a criminal court, you will probably be sued civilly for wrongful death. In either case, the attorney will do his or her best to make you seem like a murderous, gun toting vigilante who's main goal is to find someone to off.
In that light, everything about your firearm, your ammo, and everything you say will be twisted to try and prove that point.
Your "hand canon" is called "The Judge," your ammo is called "RIP." It is obvious to any thinking person that you believe yourself to be judge and jury, with a desire to see how bad your ammo can hurt a poor, misguided young man whom you misunderstood the intentions of.
And then you said that "No, I don't always carry my concealed weapon with me, only when I am going to an unsafe part of town." This will be translated as you went looking for trouble. "And I shot to kill him since he had a knife," instead of trying to stop the threat.
You can see where this is going. None of this is exaggeration, it is every day.
Go find out what ammo your police department or sheriff's department uses and consider that. Mine uses Speer Gold Dot, so my carrying that gives them one less thing to poke holes in, and it is great ammo.
Be well,
Tony