Well my theory on defensive use of the pistol is that you want the most effective gun for the fight. That is usually defined as a full sized service pistol of some sort (full sized Government model, Glock 17, etc.) as a rule I relegate the current crop of compact pistols like the S&W Shield and other similar pistols to backup status.
My main concern with a backup magazine, is staying in the fight, so the ability to retrieve the magazine quickly and keep my pistol topped off is most important. It is carried on the belt most of the time. Mission drives the gear, so I dress in clothing that conceals my gun, rather than carrying a gun that fits my style of dress. Even in hot, sunny Florida I can conceal a full sized pistol and a spare magazine or two under a polo shirt and shorts.
I won't be specific about my loadout on a public forum, but I can say that I generally have somewhere in the range of 25-30 rounds on my person in some combination of magazines and gun at any given time that fits within those parameters.
There is a "rule of threes" that applies to lethal force encounters that a non-LEO would likely face (armed robberies, car jackings, and other assorted street crimes) that it will be over in 3 seconds, and will require about 3 shots. More recent statistics also show that it may now include 3 (or more) individuals. So after a common encounter, the single stack pistol will be at lock back, and the double stack will be about half full. The purpose of the spare magazine is not necessarily for use in the current fight, but so you can be ready for the next fight (in case the bad guys buddies here the shots and decide to come check it out).
"The 1911 was the design, given by God to us through John M. Browning, that represents the epitome of what a killing tool needs to be. It was true in 1911 and it's true now." - Col. Robert Coates commanding, U.S. Marine Corp Special Operations Command Detachment 1 (DET 1)
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