[quote="jmra"}
There is a big difference between what something is "capable of" and what it is "designed" to do. I own a truck that is designed (according to the specs) to tow X amount. It is capable of towing much more but doing so may well exceed the intended design. Loading quality mags at the level they were designed for is in no way abusing or damaging them. They were designed for that specific purpose. Nor should a fully loaded mag cause a FTF in a quality firearm. I have carried every firearm I've owned with a full mag plus 1 in the chamber for many years without a FTF. I have mags that have sat fully loaded for years without issue. I removed a 1911 my FILs closet that sat with a fully loaded mag and one in the chamber for almost 60 years. The mag, ammo, and firearm functioned flawlessly.
Like I said before, nothing wrong with operating equipment below its designed performance levels. Also nothing wrong with consistently operating it at the levels for which it was designed.[/quote]
What you said before was, "I understand that many people aren't comfortable using equipment the way it way designed to be used." A little different.
There is a lot more debate about this than I would have imagined. Most of it anecdotal. Here's an opinion from some folks that should know.
http://www.gunsprings.com/resources/FAQ.htm#5" onclick="window.open(this.href);return false;
5. How often should I change magazine spring? Should I unload my magazines, rotate magazines, load with fewer than the maximum rounds?
Magazine springs in semi-auto pistols are one of the most critical springs and are the subject of much debate and concern. Magazines which are kept fully loaded for long periods of time, such as in law enforcement and personal/home defense applications, will generally be subject to more fatigue than the weekend shooter's magazine springs in which the magazines are loaded up only when shooting.
Magazine design and capacity also affect the longevity of the spring. In many older pistol designs, maximum capacity was not the always the goal such as with the 7 round 1911 Colt magazines will last for years fully loaded. There was room for more spring material in these guns which reduces overall stress and increases the usable life of the spring.
More recently higher capacity magazine have become popular. These are designed to hold more rounds with less spring material often in the same space. This puts more stress on the spring and will cause it to fatigue at a faster rate. Unloading these magazines a round or two will help the life of the spring. Rotating fully loaded magazines will also help the problem somewhat but it is not always practical.
In applications where the magazine must be kept loaded at all times, a high quality magazine spring such as Wolff extra power magazine springs, will provide maximum life. Regular replacement of magazine springs will provide the best defense against failure from weak magazine springs. Regular shooting of the pistol is the best way to be sure the springs are still functioning reliably.
I remain comfortable with my procedure.