Said about loading a spring past it's elastic limit: quote "(such as when we empty a magazine that has been over-loaded)" end quote. How's that done? Unless you modify the magazine yourself ?? Or - The company does it for you - such as 8rds in a magazine designed for 7 rds! ??? Magazine springs don't wear out from being loaded to capacity - true, if you only load them once (or a very few times) and leave them like that... Every spring wears out (looses energy) with use. Thus, the more it's used the sooner it will wear out and cause malfunctions. Springs can't rest and recover their expended energy and stretching them is even worse. A field expedient method of temporarily reviving the spring in some magazines is to get some pliers and bend the bottom leg of the spring down a tad. The manufacturer may replace your springs for free or they may not. I've been told by some that it's normal wear and they charge you for them and some will smile and give you new springs or even new magazines. Keeping a new mag fully loaded and only using it for defense and changing the rds out twice a year should let it last a very, very long time but a prudent person would still replace them with some regularity. Keeping a magazine fully loaded and using it for practice two to four times a month (or more) with several loading/firing cycles will wear it out sooner and problems will arise - but at what moment? During practice or when it's a life threatening situation? Springs are manufactured items and every spring will not have the same stored energy or longevity, they'll be close if manufacturing processes were kept proper but therein lies the "murphy" factor - and therefore if we treat every spring as if it may be the one that come out of a batch that didn't quite get the proper process, then maybe we'll not have to find out at a critical moment that it's just to weak to feed our defense ammo. So, for me, never loading a defensive magazine to capacity gives me an edge in reliable feeding...by less stress on the spring and also by less pressure on the slide the bullets are pushing against during the firing cycle - every little bit helps. I have magazines for defensive use and magazines for practice for each pistol. The defensive magazines are never fully loaded and are only used when replacing the defensive ammo, inspected, cleaned, and reloaded. The practice mags are used just for practice and are usually never fully loaded at that time. Remember the article from Chuck Taylor that described his experience with his Glock 17? In it he tells of how the first two sets of magazines would stop locking the slide back on empty (sign of a weak spring) after so much use (around 33,000 rds I think) and then he started downloading the new magazines by two rds and the problem went away...hmmmmm. edited to say that I looked it up and the 33,000 rds were the total thru the pistol where he had the first ftf. The mag failures came with the first set around 5,000 rds and on the second set with an additional 6,000 rds = 11,000 total....then he started downloading them.