What is your definition of reliable ammo

Yes , please help me know what I should look for when it comes to old or questionable ammo . I have some ammo that is at least 17 years old . I know how old it is cus I have not owned a gun in that calibar for that long .

I have already shot some of it through a friends gun a few months ago . It all seemed to work fine . It's all in good shape looks clean with no corrosion .

Does ammo go bad ? Or if kept cool and dry it should last for ever ?

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I have three boxes of old 30 carbine hp ammo made by Winchester, in paper boxes. Probably 60's vintage? I wouldn't think twice about loading, and using this.
 
Lets start off with the rule of thumb for the lifetime of propellants: 20 years for double based and 45 years for single based. Powder breaks down naturally, it is a high energy compound that is breaking down to a low energy compound from the day it leaves the factory.

Nitrocellulose-base propellants are essentially unstable materials
that decompose on aging with the evolution of oxides of nitrogen. The
decomposition is autocatalytic and can lead to failure of the ammunition or disastrous explosions.

ROLE OF DIPHENYLAMINE AS A STABILIZER IN PROPELLANTS;
ANALYTICAL CHEMISTRY OF DIPHENYLAMINE IN PROPELLANTS

http://www.dtic.mil/dtic/tr/fulltext/u2/783499.pdf


Heat greatly reduces the lifetime of ammunition, see table one in this manual for just how much:


Surveillance and in-service proof - the United Nations

http://www.un.org/disarmament/conva...20-Surveillance_and_In-Service Proof(V.1).pdf

Heat will age powder and create pressure issues:

INVESTIGATION OF THE BALLISTIC AND CHEMICAL STABILITY OF 7.62MM AMMUNITION LOADED WITH BALL AND IMR PROPELLANT

Frankfort Arsenal 1962

3. Effects of Accelerated Storage Propellant and Primer Performance

To determine the effect of accelerated isothermal storage upon propellant and primer performance, sixty cartridges from each of lots E (WC 846) and G (R 1475) were removed from 150F storage after 26 and 42 weeks, respectively. The bullets were then removed from half the cartridges of each lot and from an equal number of each lot previously stored at 70F. The propellants were then interchanged, the bullets re-inserted, and the cases recrimped. Thus, four variations of stored components were obtained with each lot.

Chamber pressures yielded by ammunition incorporating these four variations were as follows. These values represent averages of 20 firings.


Pressurevariationsduetostoragetempertures-1.jpg


Old ammunition will blow up guns through burn rate instability. This is analogous to using old gasoline in your lawn mower. Do you remember how that engine ran rough, back fired through the carburetor, and if you had continued, maybe something bad would have happened? What you want from gunpowder is a smooth pressure curve. Since old gunpowder burns irregularly, it can create pressure spikes. I found gun blowup accounts in my 60’s American Rifleman magazines, one guy shooting old WW2 ammunition blew his rifle all to pieces. On disassembling his rounds the writer found clumped powder. You don’t want hangfires, hangfires are a very discontinuous burn, the pressure waves are reflecting and rebounding, irregular pressure increase beyond the combustion structures of the gun, there is risk in hangfires.

Only Superman has X ray vision, so you won’t see the corrosion going inside of the case less you pull the bullets, but if you ever pull the bullets and see green corrosion, like what is on these pulled US surplus bullets, that powder is outgassing nitric acid gas and is beyond its shelf life. It probably will go bang, but the case will be weakened and you could be unlucky and have a case head rupture, you could also have pressure spikes due to burn rate instability.

Incidentally, double based powders, the nitroglycerine wicks its way to the surface, so the surface in nitroglycerine rich and that will spike up the pressure curve.

DSCN1108CorrodedBullets.jpg
 
Temps of 150* is really cooking powder. I can't imagine storing ammo where it might get that warm for any length of time...but that's probably because I live in Maine!! Moisture is more our problem, especially for those who live on the coast, or those who try to keep their powder in a moist basement.
 
Temps of 150* is really cooking powder. I can't imagine storing ammo where it might get that warm for any length of time...but that's probably because I live in Maine!! Moisture is more our problem, especially for those who live on the coast, or those who try to keep their powder in a moist basement

Section 7.3 of the UN Surveillance Manual provides temperatures for ammunition left out in the sun, it can get pretty hot.

Surplus ammunition can be stored in bunkers which help keep it cool, but a lot of ammunition is stored in ammo cans under tarps or ISO shelters. If you ever get into an ISO shelter that is in direct sunlight, it is plenty hot.

As for 150 F, I have found references to weapon systems that because of location, the ammunition gets to that temperature and higher. It is a concern because primers will dud (there are high temp primer compositions) and the ammunition is unsafe after a short exposure.

The bottom line is that heat is bad, the more heat, the more bad.

Moisture is bad because water is a polar molecule and that breaks down gunpowder. I have found references where too much water damages the stabilizer. Gunpowder is a very complicated mix.
 
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All my factory ammo (and handloads I used to put together) go bang when I fire them and most all gave decent accuracy.

And all the ammo fired in my cheapo Hi-Point 45 ACP pistol have gone bang also. You don't need an expensive handgun as many say.

When I was first learning how to handload and not to swift I overloaded some .243's that went "phffft" when I shot them. I only shot one (had neck cracking, primer flattening and all the other nasty signs) and pulled all the bullets on the others to restart all over again. It was totally my error. I was very careful after that.
 
Now Im hearing and read some of the reports linked earlier .

Does all this have more to do with older military ammo ? Or are we all just useing mil-surp cus that's were the reports originated ?

Are the newer powders of today just as likey to be compromized long term as the older powders .( all things being equal )

Do all manufacurers of NATO ammo use the same gun powder and are the powders used today the same as the powders in older NATO lots .

ALL things being the equal . If I had 60 year old mil-surp ammo and 60 year old commercial ammo . Would each one be just as likely as the other to be compromizied . Same question but looking in to the future . If I bought new production Federal lake city and Reminton UMC today ( I just picked some brands not sure If it matters ) . In 60 years would it be just as likely they both would be compromized the same .

Can all of the above questions have one answer . ( Generally all gun powders are made up of the same properties there fore they are all subject to the same issues ) .
 
Ive shot thousands of rounds of .223 through my Saiga 98% of which is steel cased and I've never ever had a failure of any kind in that weapon other then one issue of case head seperation using that reloaded ammo they sell at dicks.

I have had failue of winchester 12ga target loads from walmart (in several 12ga guns). and a few failures of .38 spl here and there in my model 37 (mostly remington).

Ive never had a failure from cheapo russian 9x18 with somewhere around 1500 rounds downrange.

Never had a failure to fire from 9x19 of any kind

never had any issues whatsoever with surplus 7.62x54r or any other centerfire rifle round
 
Does all this have more to do with older military ammo ? Or are we all just useing mil-surp cus that's were the reports originated ?

I put this out as a warning for all old ammunition. There is a lot of ignorance on this topic. Industry does not want you to know about powder shelf life because from a profits viewpoint, consumer knowledge is bad. You might get picky, you might not buy old stock. I am putting this out to inform that old ammunition has its risks. There will be the willful ignorant who dismiss the warning signs of hangfires, misfires, and high pressure, but for those who are wondering if those signs are indications of potentially unsafe ammunition, then hopefully this will validate their suspicions .

The only information in the public domain, for the time being, are the old military reports.

Are the newer powders of today just as likey to be compromized long term as the older powders .( all things being equal )

Yes. Nitrocellulose is the same now as when it was invented back in the 1846. The Wiki article shows the evolution of it as an smokeless propellant. You can look up single base, double base, and triple based powders, and I don’t have the slightest idea how triple based powders age.

http://en.wikipedia.org/wiki/Smokeless_powder

I am certain there are differences to the “herbs and spices” of modern powders compared to older powders, but the base is the same “chicken”.

http://www.firearmsid.com/Feature Articles/McCord_gunpowder/index.htm

Do all manufacurers of NATO ammo use the same gun powder and are the powders used today the same as the powders in older NATO lots .

No they do not and I would not expect it to be so. When you disassemble foreign ammunition and inspect the powder, it can be flaked, ball, whatever. Sovereign nations preferentially use domestic manufacturers. Keeps the money in country and keeps their people employed.


Lake City is a Government owned and contractor operated facility. Whatever American contractor wins the bid uses whatever powder, primer, they want, be it from within their company, or from a foreign supplier, as along as the source is not forbidden. There are "buy American clauses", but what is "American" has been manipulated by Corporations. Military specifications are now performance specs, not the product specs used way back when. As long as the pressure curve, velocity, shelf life, etc, meet the performance requirements, it is up to the contractor to figure out which propellants and primers to use. This was not true back in the days when the Army ran their own Arsenals. There were a limited number of propellants used in US ammunition , all of domestic manufacture, and the product specification could require a specific propellant.

Briefings on NATO ammunition can be found on the web, basically the ammunition is to be interchangeable between countries. What powders NATO countries use is up to them.

http://www.dtic.mil/ndia/2011smallarms/WednesdayInter12315Pellegrino.pdf


Newly manufactured ammunition by commercial outfits, such as Federal, Winchester, Remington, powders they use is determined by what maximizes their profit. These companies will purchase out sourced powders if it is cheaper than buying from their powder division. These companies change powders and suppliers all the time.

But, military ammunition and commercial ammunition is the same basic chemistry of nitrocellulose (single base) or nitrocellulose with nitroglycerine (double base).

ALL things being the equal . If I had 60 year old mil-surp ammo and 60 year old commercial ammo . Would each one be just as likely as the other to be compromizied . Same question but looking in to the future . If I bought new production Federal lake city and Reminton UMC today ( I just picked some brands not sure If it matters ) . In 60 years would it be just as likely they both would be compromized the same .

Given the same storage conditions they will deteriorate at the same rate. There will be little differences between lots, based on manufacturing variances, based on stabilizer chemistry, and there will be differences in the rate of deterioration of single based powders and double based powders, because nitroglycerine increases the reduction-oxidation of nitrocellulose.

Can all of the above questions have one answer . ( Generally all gun powders are made up of the same properties there fore they are all subject to the same issues ) .

Yes.
 
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Slamfire

Thanks alot for the detailed answers . Seeing those corroded bullets you posted got me thinking . Man , you would never be able to tell that was happening inside the case .

You may not understand the chemistry but you will remember the effect.

I love that line . Thats what put me over the top and wanted to know as much about this issue as posible

Thanks again :)

Metal
 
I believe that the Hodgdon Powder Company started by selling WWII surplus bulk powder stored in boxcars for 25+/- years. They re-packaged it and it was about as good as the day it was made. It probably wasn't exposed to extreme heat, however.

I have a few cans of powder that I bought more than 25 years ago and it's still good, but it's been stored in cool, dry conditions.
 
I store my ammo in my home, and it never gets over 90 degrees let alone 150 degrees. I have shot lots of surplus 06 ammo probably from Korea, or WWII with out any issues other than cleaning up after using corrosive primers.
 
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