Bob,
It wouldn't hurt to download your mags to about 80-90% of their full capacity. You could leave a few extra rounds so that you can top off the mags IF you have time and the situation permits. Otherwise use the mag as is. I would recommend rotating mags periodically. How often is up to you. I do it every month but some do it every week. Maybe you can do it every time you go to the range? My 2 cents.
Corbon91
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"The rifle is the first weapon you learn how to use because it lets you keep your distance from the client. The closer you get to being a pro, the closer you can get to the client. The knife, for example, is the last thing you'll learn."
[This message has been edited by Corbon91 (edited September 01, 1999).]