Luger Reliablity-Stong Springs help

I'm new to Lugers (don't even have one yet) but a fairly experienced shooter. Years ago a Marine armorer advised me never to load my "clips" (i.e.,magazines) until I was on the range ready to shoot. He said that, over time, springs in loaded magazines lose their "springiness". (I've forgotten the technical term for spring stregth). Hope this is helpful. Thanks to all who posted to my "newbie" enquiry; and I've learned a lot merely by lurking here in the Forum. Regards to all. Ad.