I've been told - by the cops... Not to bring a gun to a knife fight in so many words... Appropriate use of force can back-fire on you... My van is on a public street in front of my house - 15' away from the curb is my property line on my front walk... If I see someone out there - I have to warn them.... (This is where I got in trouble before...)
If they flee - it's a cop problem... If they turn and extend a threat across my property line where I am - I can defend with appropriate use of force. If they cross my property line with a bat or pipe - I can beat them to death with a bat or pipe (see that's equal...
)- or some type of non-lethal round like bean bags or rubber balls....
Which at 20' may or may not kill you... Then if the person is still on your way to cause imminent harm I can escalate to buck-shot or a deer slug... The next shot in the slide... (One cop said it doesn't matter which rounds come first... They can't tell - and won't care... But helps provide prove of escalation.)
But he - the person turns with a gun from the street - which would extend a threat across my property line putting my person - not my property - in eminant harm - I can put a deer slug in them...