And ammo s is made of metal casings primers and the bullet hence moisture exposure will eventually rust your ammo.
Keeping guns in attic.
I live in nc it gets hot in the summer and cold in the winter especially in the attic.
While keeping prescription refills or extra otc medication in your attic may seem like a smart way to keep them out the reach of children doing so can cause a whole lot of problems.
In 1992 i stored my firearms in my attic during the summer west central georgia.
Cosmoline is one of the best.
To keep your stored ammo organized stack the original boxes on shelves on the floor or in a large mtm plastic box.
Keeping your ammo dry.
What you should do if the garage is the only place for the gun safe.
Gun metal should be coated in a preservative that won t drip or run off.
It will begin with small amounts of surface rust which you can sand off and your ammo will still fire but even this may.
To be thorough however requires that we sit down at the bench and clean and lubricate our guns properly.
Preferably invest in high quality climate controlled gun safe made with durable steel and locks that has a vault design.
If you put the guns in the attic do two things.
Humidity is even more dangerous to your ammunition than temperature swings moisture is corrosive to metal.
Quality gun care products will keep your guns pristine for many years.
Then swabbing the bore and lubricating it properly.
Open to the outside air attic.
Ok to store here as long as the temp and humidity are kept stable.
Cover them with insulation or such to conceal them.
Keeping guns in attic.
It gets up to 100f sometimes and its probably well over that in the attic.
I fire mostly 9mm and 45 acp handguns but i also use 223 and 308 rifles.
But if you have an attic with plenty of space you can use that too.
I realize that the cold probably wont be a problem but will the heat effect the guns ammo at all.
Bad idea to store guns here they will deteroriate over time.
That means cleaning the exterior with a quality cleaner and a lubricant.
Closed to the outside air attic.
If you do need to keep the gun safe in the garage you can take some precautions to prevent the above scenarios from taking place.
However heat rises and air circulation isn t typically ideal in an attic space which means temperatures inside of an attic frequently reach three digits during the summer.
In addition to gel capsules potentially melting in the heat some medications may lose their efficacy when stored at high temperatures.