Self defense and home defense with a firearm is still legal (in most areas) in the US of A. To shoot someone in defense of yourself and your family is a horrible thing. If that person is still alive to sue you, you will regret using birdshot. That is a BIG "IF". Youl do not shoot to kill. You do not shoot to "stop". You shoot to live. Failing to disable the intruder does little to keep you alive. You run significant risk of just pissing him off.
USE BUCKSHOT. EVEN #4 buck is better than birdshot.
In life, strive to take the high road....It offers a better field of fire.
"Robo is right" Fuzzball