Some other facts are in order. A VAST majority of self defense shootings are not prosecuted at all. The prosecutor, after review of the evidence, either declines to file charges, or in places where he's required to, he takes the case to a grand jury with a recommendation to no-bill. Prosecutors offices are not flush with cash, and they are not in the business of pressing forward weak cases with legitimate claims of self defense in play because they lose those cases, and their bosses, and ultimately the elected officials and taxpayers get really tired of that stuff, and fast.
If charges are filed, and a case advances to a jury trial against you, you can rest assured that you will be presenting a defense, at tremendous expense, and that defense will not consist of a claim of "self defense" after which your attorney confidently rests his feet upon the defendants table and watches as the prosecutor wets himself because he doesn't have the goods on you. The presumption of justification if that claim is made is almost always a rebuttable presumption, and the rebuttal is also by preponderance of the evidence, not proof beyond a reasonable doubt. Because lets face it kids, the hurdle the prosecution has to go over is EXACTLY the same, whether you claim self defense or not, which is to prove beyond a reasonable doubt that you willfully or intentionally killed another person with criminal intent, and proving that by itself already rebuts your claim of self defense completely. Or else he argues you killed the person neglegently or accidentally, which you seal your own fate behind by claiming self defense, which is an intentional act, throwing neglegence and accident out the window with it.