Ive had many answers in this so please give me your $.02. Is there a point where my carry rounds are no longer any good? Can i carry the same 15 rounds for 6 months? A year? 2 years? I do switch out mags occasionally. I rotate between 3 mags, each is a different type of HP or JHP. I live in south Texas, lots of heat and humidty, what effects can this have?