Firost off, I amnot an attorney, so this advice is only worth what you are paying for it: The only legal use of your weapon is when you or someone in your care is in immediate danger of death or grave bodily harm. You point your gun at somebody who is not a threat and you are charged with Aggravated Assault.
Please read the books mentioned here, especially Ayoobs.
Jim Cirillo is another good one.
Jim