no I do not store magss loaded except those I keep in the range bag or in truck ( hog Rifle) or in my carry pistol all other mags are not loaded. I have read both pro and con on this subject my thoughts are the ammo should be stored anyway and the spring will be jus fine when I load them also I have spare springs for all my mags as it the springs that go not the body

again read my advice

regardless where you live do not store metal in plastic without paper or bore store material in contact with metal, metal on plastic will discolor the metal as the plastic degrades