While I don't have a problem loading mags beforehand, and it may be better having been done in a more comfortable, less-rushed environment, I don't think keeping them loaded vs not would/should make a difference. If the springs "settle" by letting them sit, then that would mean the steel is taking a permanent set, which should not be possible on a properly designed spring. Or if it is, it will occur the first time it's used, then be the same thereafter.
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