1st, lets not forget that 90%+ of us aren't copsI remember one time at Paul Abel's range (the man who taught me everything I know) one of our LEOs had on his duty rig, with his Glock 17 and one of those Safariland triple mag pouches...
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Paul asked him, "damn son, are you that bad of a shot?"
Of course the officer replied with the classic response, "I'd rather have too many than not enough."
Paul told him, "YOU are responsible for each and every round you fire. Not your agency, not the sheriff or DA...YOU. So if you fire sixty-something rlounds and only hit your target 10 or 20 times, you're probably gonna buy some old lady a brand new Cadillac, every year for the rest of your life."
Accuracy trumps mag capacity every time.
2nd, lets not assume that we are already going to have our gun drawn. Us regular guys are more than likely to be reacting to a already drawn weapon. To get that 1st or 2nd shot off on target isn't likely when you're already behind the power curve.
3rd, NOT A DAMN THING WRONG WITH HAVING ROUNDS LEFT OVER