I do it a little different. I don't want to take the chance that keeping the spring 'fully' compressed might weaken it so what I do is to keep my guns/mags down loaded about 25% if I want them ready to use but may leave them loaded for long periods of time.
Example, 3 rds in a 4 rd tube shot gun. 5 rds in my 30-30 7 rd mag tube. 12 rds in my 15 rd pistol mags. I avoid the max compression but the guns are still 'ready' if needed.
Hope that helped.
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