A local home invasion involved 6 bad guys...
Not 6
ARMED BG's. Most BG's will put the Shoebaru's in high gear once they hear shots. If not, then I run like an Olympic sprinter.
I say that being worried about having 6 rounds as opposed to 5 is a moot point. If you're going to change the CCW for more capacity, get a double stack semi. You have to decide if it's worth it to change your whole lifestyle to be prepared for something thats less likely than winning the lottery.
If so, invest in a lot of semi-autos that use the same mags (brand doesn't matter but something thats cheap with cheap mags would be good). Scatter said semis throughout the house. Keep a spare mag or two with you at all times. I like the AR HD Carry gun idea too.
I hope you live alone if you were ever to need to defend your home against 6 or more BG's because thinking about all of those backstops makes my head spin. Engaging all of them would be hard enough. Not killing one of your family (if applicable) or neighbors at the same time would be harder.
My remedy for multiple BG's?
Mossberg 500A, (5) #4 shot in the tube and 4 more in the speed feed stock. That runs dry, out comes the 1911 with a 10 round mag in it (assuming I don't just go to swinging the 12 ga like I'm Babe Ruth). That runs dry, I'm screwed no matter what I've got left (14 more 1911 mags BTW).
What do I normally carry while inside my home? NAA 22 mag 5 shot.
All those mags would be heavy.