This'll make RG cringe, but it occurred to me that I'm not looking for "stopping power" (as in putting the guy down) in a firearm and load, I'm looking for "repelling power". Because, as I said, I don't want to kill or seriously harm anyone. I want him to run off, not bleed out in my living room.
It seems like if someone wants to kill me, they can just jump me as I come out of my house, or follow me to work and jump me there, or to the grocery store and gun me down in the parking lot. I'm not worried about people wanting to come into my house to kill me, and who are willing to risk their own lives to do so. There's easier ways. And I'm not going to get into a shoot-out in my home, nor am I going to try to flush them out if they lie in wait somewhere downstairs.
I can't do anything about my vulnerability to someone wanting to kill me, so I'm not trying. I just want to be able to get an intruder to leave my home immediately. So I'd favor something typically non-lethal, especially considering in California they like to charge people with crimes for defending themselves and their homes/businesses, so it would be a plus if I had the legal standing of using something that didn't qualify as "deadly force".
But unfortunately the less the lethality of a load choice, the more that reloadability comes into play. For me it would be a balance of potentially killing or maiming, versus having to only say it once. And I think I would weight it in favor of the latter. I.e. I don't want to have to reload in a panic situation, so it's got to be a strong enough single response, to dissuade those even high on something, but should be no stronger. Or as close as I can get to this, I think.