It’s pretty much the same here in Australia. Reasonable Force is a term used by the Police and legal fraternity to muddy the waters. If a guy came at you without any weapon other than his fists, and you shot him, that is not considered reasonable force. However, if he had a knife or a gun or maybe a baseball bat or a sword, and you shot him, then it would be a good argument in Court for reasonable force. Then there’s the “reasonable person” consideration...would a reasonable person consider your force used to be acceptable and reasonable...again, muddying the waters.

I’ve heard a number of LEO say...”dead men don’t tell lies”, so if you are forced to protect/defend yourself or loved ones...make it lethal and ensure he had/s a weapon. When the Police arrive, make sure you are leaning over the body, trying to apply first aid, and saying emotionally...”I told you to stay back and not touch me or my family, but you wouldn’t.” That way when it goes to Court, which it will, you’ve covered your bases as best you can and can only hope that things will be found in your favour. BUT DON’T, NEVER, DO NOT, USE A FIREARM...you will have broken the law, no excuses.