Do not make the mistake of thinking more rounds in a weapon will somehow increase your safety for:
Spray-n-pray does not work.
Machinegunning your opponent does not work.
Having a zillion rounds is meaningless.
It is good powerful hits, from the first shot to the last, that are important.
Carry the most powerful gun you can shoot well AND conceal with your everyday cloths. And by shooting well I mean being able to control it fast, one handed, at reasonable SD ranges.
"The government has confiscated all of our rights and is selling them back to us in the form of permits."