My Glock 22 holds 15 rounds, so I'm pretty sure I have enough ammo to successfully defend myself in just about any situation. Sure there are those out there who'll say that if you can't hit what you're shooting at with 7,8, 10, or 15 shots, then you should wait until you've had more practice before you resume carrying. I disagree. If you feel you need an extra mag or speedloader (or two or three), then by all means, carry it. I'm of the mind that it's better to carry more ammo than you need than to need more ammo than you have. All of the range practice in the world does not substitute for a real life encounter with a criminal, which I'm pretty sure would wreak havoc on just about anyone's accuracy. In the heat of battle, I'm certain that most of you would not shoot 2-inch groups like you would at the range. Sure, those missed shots must hit something, but in the end, if all you have is the 8 rounds in your mag, and you need more, it's better to have that extra mag than not.