20 yards? Really? Maybe with a lotta practice. Seems to me that you gotta be within 15 feet or so to hit the bad guy with a .410 and IMHO that's too close. LOL, probably scare the shit outta him tho. I'll stick with my AR-15, with 30 5.56 bullets heading your way as fast as I can pull the trigger. And the ladies can swap out the BCG and use .22 LRs as soon as she sees the guy. Even a .22 is pretty loud indoors, and I'm thinking that when she starts shooting I'd be getting my happy ass outta there before she shoots something that I don't wanna live without.