john, you crack me up. you know way more about guns than anyone living in berkeley should
i would skip the .410 shotgun. if someone has exhausted all options, and all is left is to kill the bastard, a .410 wouldnt be the best choice. my family has a .410. i sidebyside. i couldnt hit crap with that thing. doves were buzzing me on purpose to make fun of me. poor bastards didnt notice when i switched back to a browning citori. hehe. dove soup!
for home defense, i would get a benelli in 12 gauge. it doesnt kick hardly at all. i think the forces get vented to actuate the action. and any badguys would get the message quick. only downside is $$$$. weapon of choice when the neighborhood becomes a law-less wasteland.