Stored ammo is in my house where the humidity stays below 56% year round. Lower in winter , because I heat with wood, whic is really dry, and we run a humidifier all winter to maintain 50%. My guns are in safes with golden rods and the humidity stays between 50 -56% year round, I also keep desicant bags in the safes withe the guns, never any rust problems. Of course I do wax all my guns , once a year. Jim