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I never had this problem in California, but now that I live in Florida my garage get over 100 degrees.
The afternoon sun hits my garage door for hours. I know that I need to insulate my door.
I keep most of my ammo in a locked cabinet . Of course I will not shoot it when it’s that high temperature.
Am I ruining my ammo?
 

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If you are storing ammo in a hot, humid environment then yes, you are ruining it.
Lead will frost, powder will degrade and brass will tarnish.
I live in Houston, similar climate, and all ammo, powder and primers are inside. I would never store any of it in my garage. I've seen what happens to tools, plastics, chemicals etc after 5-10 years.
 

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If you are storing ammo in a hot, humid environment then yes, you are ruining it.
Lead will frost, powder will degrade and brass will tarnish.
I live in Houston, similar climate, and all ammo, powder and primers are inside. I would never store any of it in my garage. I've seen what happens to tools, plastics, chemicals etc after 5-10 years.
That's what I found in coastal South Carolina. Looking at what happens to my stuff in my shop, there's NO WAY I would ever take out anymore than I intended on using.
 

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When I am reloading I make sure no primers are left in the Dillon 750 and I empty the powder measure back into the container. I won't leave either in the garage overnight.

A friend who lives near me left primers in his Dillon for a couple of weeks and he had multiple primer misfeeds until he started using new ones directly from his house. The humidity is just a major issue.
 

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Cool and dry place for storage makes ammunition last for about 100 years if it is 1970s non corrosive or manufactured more recently.
 

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Pretty sure most milsurp has lacquered primers...and it becomes 'surplus' when it gets sketchy due to poor storage.Why else would they offload it?

I had some 1980's Malaysian surplus 5.56 that i bought mid 1990's. Looked terrible. It fired but cases were seriously tarnished and I unloaded it during the Obama Panic.
 

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I store mine in "sealed" ammo cans in hot ( 90's F ) garage. Military ammo has been stored in warehouses in hot deserts and jungles for extended periods.
Those temperatures will degrade the ammo over time. Humidity is worse than heat but storing at 90 to 99 Fahrenheit will slowly degrade it. I imagine it will likely take over ten to twenty-five years. Store your ammo at 75 degrees Fahrenheit or cooler with no humidity and it will last for one hundred years or longer if it is non corrosive 1970s or manufactured more recently.
 
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I never had this problem in California, but now that I live in Florida my garage get over 100 degrees.
The afternoon sun hits my garage door for hours. I know that I need to insulate my door.
I keep most of my ammo in a locked cabinet . Of course I will not shoot it when it’s that high temperature.
Am I ruining my ammo?
I never had this problem in California, but now that I live in Florida my garage get over 100 degrees.
The afternoon sun hits my garage door for hours. I know that I need to insulate my door.
I keep most of my ammo in a locked cabinet . Of course I will not shoot it when it’s that high temperature.
Am I ruining my ammo?
Yes. I lived in Orlando for 10 years and stored all ammo and reloading components in sealed cans in a climate controlled room. My 25 year old cases of Federal GMMK Will still shoot 1/2 MOA or less. A friend kept his ammo in sealed cans in his garage and the heat degraded the powder creating higher pressures, very poor accuracy and some split cases.
 

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If it is gonna be prolonged storage, best is cool and dry place. Dessicant materials be required in humid areas.
 
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Wood is a great insulator . Your garage floor probably stays in the 70s . You can sketch up a box with a hinged top out of 1” x 8” boards. lowes will cut pieces for you. Use a thinner piece like 1/4” on bottom. Assemble. Store ammo on floor in box. The contents will stabilize some where btwn air temp and floor temp. Even easier might be to use one of those wood cases commie ammo comes in although it might not work as well as a thin bottom box for contact coolness with floor. You can even use some of that thin packing material from staples for added effect over the ammo inside of box though not on bottom.
 

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Wood is a great insulator . Your garage floor probably stays in the 70s . You can sketch up a box with a hinged top out of 1” x 8” boards. lowes will cut pieces for you. Use a thinner piece like 1/4” on bottom. Assemble. Store ammo on floor in box. The contents will stabilize some where btwn air temp and floor temp. Even easier might be to use one of those wood cases commie ammo comes in although it might not work as well as a thin bottom box for contact coolness with floor. You can even use some of that thin packing material from staples for added effect over the ammo inside of box though not on bottom.
How does this mitigate the effects of 90% humidity? Even my FMJ projectiles tarnish after a few months.
 

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old coolers where in florida?
 
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