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Most of the folks who are familiar with metal/metallurgy say that WORKING springs shorten their lives.
The folks at Wolff Springs agree with that and note that HOW you work the springs makes a difference, too. For example, the recoil springs in Compact guns have a shorter operational life than do the recoil spring in full-size guns: those springs have to do as much work, in a shorter distance.
They note that in addition to the normal wear (through flexing), other things must be considered. With regard to mag springs:
1) If its a 10-rounder or less, you can store them without concern, fully loaded; the springs will be good, even if left for years between uses.
2) If its a 15-rounder (or hi-cap), that spring is being pushed to its limit, and its best to download a round or two during long periods of storage.
With most guns, the same springs are used in 10-round mags as are used in the 15-round mags. That being the case, it stands to reason that the mag spring in a hi-cap is being COMPRESSED more when stored loaded, and pushed closer to its design limit. That spring has a harder "life."
I've started doing what Wolff recommends.
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