The ammo is good long term. The springs will fade over time. Cycle through your self defense mags with spares every few months and you'll be fine.
As for cycling mags causing wear, yeah probably. But shooting through the same mag 10 times at a range is a few years worth of cycles in a single day compared to the number of times you cycle them out.
I have a pile of mags for the range, I shift my self defense mags through this pile whenever I think about it (a few times a year).
Also, shoot your SD ammo, so you know how it handles, that you gun cycles it, etc. Using RIP/Trident ammo can have feeding problems that could be deadly to you if you can't cycle your gun. Know what your gun will do and stay safe.
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