Long term ammo storage questions

westernrover

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I live in an arid climate, but I still take care to manage moisture and humidity when storing things long term. Until recently, I've primarily stored my ammo as components. I'll leave component storage to another discussion in the Reloading/Handloading section. The following is about storing loaded ammo.

In Magazines
It makes sense to store ammo for ready use in magazines even if they may not be needed for many years. It would depend at least on reliable, durable magazines where the spring won't set or the feed lips push out after a long, long time. Also, the magazines and ammo in them would still need to be stored in a sealed container like a metal or plastic ammo can with an o-ring seal. I don't personally have any experience storing loaded magazines over the long term. Do you have any concerns about damage to the magazines being stored full for 10 or 20 years?

In Clips
The reason I haven't previously stored full magazines is because my firearms primarily use clips. I store many hundreds of rounds in moon clips, but those tend to be the ones that get used and re-filled rather than ones stored long term. Stripper clips, on the other hand, seem a like a good way to store ammo for the long term. They're particularly attractive for storing ammo above and beyond the quantities that I could fit into the magazines I own. Three ten-round strippers cost less than $1 and I haven't seen good magazines that cost near as little. The strippers and a spoon make loading a magazine quicker in the moment. Someone could argue loading the strippers takes as long as loading a magazine, but strippers could be loaded at leisure while facilitating a quick magazine reload when one doesn't have leisure. No doubt an additional magazine is preferable for convenience but unless the entire inventory of cartridges can be contained in available magazines, clips seem to have a place. Their place would also be in a sealed can of some kind or a bandoliers within the can.

In Bandoliers
This might have logically fit better between Magazines and Clips, but I had to introduce clips first before I could discuss bandoliers. The most popular bandoliers must be the 4-pocket type that hold 3 clips in each pocket. Seven bandoliers pack in a 50-cal can for 840 rounds of 5.56. It's somewhat costlier to repack loose rounds or clips into bandoliers, but it must still be less costly than magazines and although time-consuming, it would greatly facilitate transport of the clips and reloading magazines when that time came. There are various bandoliers for 7.62x39 for the AK or SKS, and 6-pocket bandoliers that fit two clips of 7.62x54 for those guns with 20-round magazines. Similarly, a Mini-14 typically takes 20-round magazines which can also be preferable for AR's that are fired from prone positions. For those, I've found the 7-pocket, 2-clips per pocket bandoliers (Vietnam surplus). These pack six into a 50-cal can. The bandoliers often use cardboard inserts. Would this be a safe way to store them for the long term assuming the bandolier was thoroughly dried before being loaded and stashed in a sealed can with some desiccant?

In Factory Cartons or MTM boxes
Neither of these are sealed, so they'd still be going into a sealed container. The cardboard factory cartons can hold moisture so they must be dry before packing. The greatest appeal factory cartons have for me is for resale or trade. I use MTM boxes to store ammo for my own use that doesn't fit into clips or magazines (usually the low-quantity varieties). But for 5.56 and 9mm, I'd like to have boxes of 20 or 50 for resale, trade, or gifts in times of shortage. I think the factory cartons would be more desirable than loose rounds or anything that looks like reloads. Are there any concerns with storing in a sealed can factory cartons like 20-round boxes of Federal XM855 or 50-rounds of Winchester White Box?

Loose Rounds
I've seen them stored in ammo cans, vacuum-sealed bags, Zip-locs, large steel drums... you name it. I suppose for the largest quantities, it's the only method practical. I can also see how for a cartridge like 9mm where an UpLULA makes more sense than stripper clips, that loose rounds would be the most desirable way to store ammo beyond the capacity of magazine inventory.

Sealed Containers
Unless the ammo is in sealed bags, a sealed can or container of some kind seems necessary for long-term protection. I store my reloading components in sealed bags, so I don't have experience with ammo cans. I just bought a "Fortress" brand 50-cal can for $19.98 delivered. Is this a mistake? I haven't received it yet. I could buy US-made cans in good used condition in a modest quantity without paying a lot for the cans, but the shipping cost is killer.
 
Sportsman's Guide sells US surplus M2A1 boxes for $9-10, and may offer free or reduced cost shipping at some $$ threshold or to members. SG ammo ships some rounds in ammo cans, and the cost differential is minimal. Strippers, spoons etc may be available here at lower cost: https://www.cleanammocans.com/stripper-clips.html I have no experience with this merchant, but Sportsman's Guide and SG Ammo have been good to work with.
 
Sportsman's Guide sells US surplus M2A1 boxes for $9-10, and may offer free or reduced cost shipping at some $$ threshold or to members. SG ammo ships some rounds in ammo cans, and the cost differential is minimal. Strippers, spoons etc may be available here at lower cost: https://www.cleanammocans.com/stripper-clips.html I have no experience with this merchant, but Sportsman's Guide and SG Ammo have been good to work with.

I tried cleanammocans but found their shipping on cans raised the cost too high for me. However, I just tried them again for the clips/spoons only and I found they offer free shipping on those. I was able to beat the best price I had found on eBay by more than 15%. This is for 200 clips and 10 spoons. I'm thankful for that.

At SG, I'm able to get 3 cans shipped for $38 with a 3-month membership that reduces the cost of shipping. That's less than $13/can including all costs. Provided the used cans aren't badly beat-up or rusted, that's the best deal I've seen online. Locally, I don't hope to find anything better at the occasional shows. My rural area is underserved in that respect. Thanks again!
 
Our heating and cooling system keeps the temperature and humidity pretty even in the house so storage is not a big problem. I feel like ammo and components will age really well stored in the closet in my loading room. I have ammo in MTM boxes on the shelf, in MTM boxes in ammo cans, in ZipLoc bags in ammo cans and in magazines and clips. I also have factory ammo in the original boxes in a metal cabinet on top of my safe.

Back during the beginning of the first Gulf War I bought 2 pallets of 50 caliber ammo cans for $1 each. I have enough MTM boxes that MTM should send me a Christmas care every year! ;)

I have had some concern about leaving magazines loaded for the long term but those fears seem to have been ill founded. Would be interested in others experiences.
 
I use the tried and true 50 cal ammo cans if the seal is not damaged those cans are about the best thing around.
 
Mil ammo cans in basement cold storage area. Temp around 55-60 year round.
 
.50 & .30 cal cans are just the best thing. Stackable, good handles, tough as nails.

Grab some and hit the range. Easy.

Well, a full .50 can of loose 45ACP is a bit weighty, and doesn't fit the 'grab & go' paradigm.

Most loaded magazines will fit one way or the other. They seal out everything nasty.

I keep a good quantity of loose rounds in some as backup, they hold more than boxed stuff.
 
I use standard GI ammo cans. Usually pick them up used for $5 at the local gun shows.
Same, plus I put reloads in MTM plastic boxes and use factory cartons, too.

To me the biggest issue is with ammo storage conditions. Wild temperature fluctuations (especially high heat), humidity-moisture, etc. are the biggies to avoid. My ammo is in the most stable corner of my attached garage (It has 6” insulated walls) so the temperatures don’t swing wildly and it isn’t damp. Ammo stored in an outbuilding, shed or an uninsulated garage are subject to temperature swings that can’t be good for gunpowder longevity.

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( I know our barn on the old family ranch had at least a 100-110 degree temperature difference between January and July, maybe more. There was some old .257 Roberts ammo my Grandfather left in there in the old green Rem Kleanbore boxes that looked like it was 150 years old.)

Stay safe.
 
Gi ammo cans are ideal, seems like price fluctuates a lot. Wonder how many older vietnam or that age are still out there.

Don't get new ones you see at walmart, pure junk.

I don't mind mtm plastic 50 cal ones.

Vacuum works well too, I can cut bag any size I need.
 
Does climatic temperature itself have any meaningful effect on ammo or on powder that is sealed inside? Exposed powder is going to have a limited shelf life for sure. I am also sure that temperature swings that result in condensation on the brass and copper would ruin them. My own ammo is stored in an attached garage, but I understand the specification for the US ammo cans is for un-sheltered storage for 10 years. I suspect that as long as the ammo is sealed away from moisture, normal heat and cold cycles will not affect the ammo. Stacking ammo cans is improper because it puts excessive weight on the lid seals. I doubt that stacking two cans is going to ruin the seal, but stacking them several high would shorten the life of the seals.
 
Factory boxed ammo in case quantities stacks great, resells great and should be fine inside a home without humidity issues indefinitely.

I sort of wish I had just left mine in the original cardboard cases
 
I do the vacuum seal/ammo can thing, I recently loaded 600 223rem and put them on stripper clips 2 or 3 to a bag with a spoon in the ammo can. When I load pistol ammo I put them in vac sealed bags in 50rnd counts, revolver rounds I put in speed loader loaders I printed in 3D and store in ammo cans, 44mag, 10 loaders per layer, 3 layers in a plastic 30cal can, haven't printed 38 loaders yet. They are designed to interlock but for my needs this works (about all the 44mag I can shoot in a day) 20230209_164905.jpg
 
I bought most of my ammo from Cabela's and they sent it in Plastic Ammo Cans with moisture seals around the lid. Sometimes you BOGO, so I would buy ammo that I needed. This was about 10 to 15 years ago when ammo was cheap. All my ammo is stored in these cans, even my reloaded ammo. All ammo is stored in filing cabinets on 2"x2" steel frames with casters on the corners. They roll easily.
 
Concern about long term storage in:

In Magazines — No
In Clips — No
In Bandoliers — No
In Factory Cartons or MTM boxes — No
Loose Rounds — No
Sealed Containers — No

In remotely climate controlled conditions, loose ammo laying in corners on the basement floor, once you dust it off, will almost certainly work fine 100 years from now. We do extras like seal bags, etc to avoid accidental damage from exceptional conditions like loss of power (heat, condensation) floods, crushing, etc.

I regularly hear of people pulling loaded rifles out of their hidden place (not sealed) in the house 50 years after being stuck there and off to defend from the invaders. A favorite semi-lately was some US soldiers in Afghanistan who found a working Maxim gun, had enough gun nerds to clean and put it back into service without mail ordering parts even, then just put out a want ad with the locals for belted 8 mm (they paid cash or traded something for it, but I forget what). This would be stuck away in the corner of huts and buried in wooden crates for upwards of 100 years and... essentially all ammo worked, only belts (fabric!) were an issue and most of those ALSO worked fine.

Gun stuff is built to last, military (sealed primers, etc) doubly so.
 
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