I have always had revolvers lying around in the night stand for home defense. But I recently have replaced my revolvers with my P99. My question is should I load the mag to capacity or only half way to save on the mag spring tension? And what is the life expectancy of a mag spring. If I load one to the max how long can I leave it before I should worry about feeding reliability? You individuals who serve in law enforcement, do you change mags every night, once a week or once a month? What is the standard rule of thumb that you follow for keeping mag springs in proper tension?