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Pictures of Corrosion. inside MEN94 cases.

This is a discussion on Pictures of Corrosion. inside MEN94 cases. within the Ammunition forums, part of the M14 M1A Forum category; Yes. Or, at least it feels like rubber. [IMG] [/IMG]...


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Old January 26th, 2012, 06:45 PM   #16
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Yes. Or, at least it feels like rubber.

[IMG][/IMG]

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Old January 26th, 2012, 06:49 PM   #17
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Some of the ones with the pinkish colored, pitted corrosion, was corroded all the way through to the inside of the case. Although many were not.

On the ones that were, the corrosion was starting to effect the powder, and some of the powder was stuck fast to the inside of the case. A lot of the new members may not be aware of this particular type of corrosion, so I thought I would show that this type of corroded case, was not safe to shoot, and what they looked like on inside. The little spots inside the cases, are where the powder was stuck, and started to corrode the inside of the case.

[IMG][/IMG]

[IMG][/IMG]


I should also state, that the ones with light corrosion, such as these, are perfectly safe to shoot. Just clean them up with 0000 steel wool.
If the corrosion shows up on the inside of the case and it originated from the outside.....THE CASE HAS HOLES IN IT!!....I don't think they are safe....

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Old January 26th, 2012, 07:09 PM   #18
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Mocos, you are correct. That is why I posted the pictures. Lots of new people here and I would hate to see someone hurt themselves or damage the chamber on their rifles.

Sometimes it's easier to understand what someone is saying, when there's a few pictures thrown in.

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Old January 27th, 2012, 03:34 AM   #19
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Nasty. Salt water exposure? Lime?

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Old January 27th, 2012, 06:58 AM   #20
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Nasty. Salt water exposure? Lime?
Acidic composition of the cardboard boxes they ship in.

Many paper products are known to be acidic.

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Old January 27th, 2012, 09:37 AM   #21
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Wow, good to know info! Why is it important to wipe off the oil before firing? I never thought it was a major issue.

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Old January 27th, 2012, 10:23 AM   #22
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Wow, good to know info! Why is it important to wipe off the oil before firing? I never thought it was a major issue.
Leaves oil in the chamber, which attracts contaminants, which build up, which causes malfunctions.

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Old January 27th, 2012, 10:43 AM   #23
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I have always read that oil or any fluid in the firearms chamber can cause higher pressures. Not worth the risk.

Someone else may have a better answer or may be more knowledgeable on this.

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Old January 27th, 2012, 11:00 AM   #24
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Back in the early 1990's I bought allot of 'tarnished' .308 from the now out of business Paragon, Inc in IL. There was tarnish on the outside of the case that ranged from slight staining to allot of corrosion.

The headstamps were from the British manufacturers OFN and Kynoch. Shot several thousand rounds through my Armscorp and FedOrd M14 semi-autos. Only problem I had was a few duds. Never checked the inside of the cases.

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Old January 27th, 2012, 11:22 AM   #25
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I have always read that oil or any fluid in the firearms chamber can cause higher pressures. Not worth the risk.

Someone else may have a better answer or may be more knowledgeable on this.
Oil in the bore will do this. Oil in the bore is an obstruction, not a lubricant.

It is unlikely that oil on a cartridge case will migrate to the bore, unless the cases are dripping wet.

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Old January 27th, 2012, 12:08 PM   #26
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Quote:
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The headstamps were from the British manufacturers OFN and Kynoch. Shot several thousand rounds through my Armscorp and FedOrd M14 semi-autos. Only problem I had was a few duds. Never checked the inside of the cases.
OFN is from the Ordnance Factory Nigeria, Lagos, Nigeria.

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Old January 27th, 2012, 12:49 PM   #27
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I to about 1 year ago broke down my battle packs and about 10% had the green corrostion on the ammo from the cardboard boxes. I stored it loose in metal surplus USGI 30 caliber ammo cans. This should be a sticky post. Nice work on the pictures and right up.

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Old January 27th, 2012, 01:20 PM   #28
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I have always read that oil or any fluid in the firearms chamber can cause higher pressures. Not worth the risk.

Someone else may have a better answer or may be more knowledgeable on this.

+1 - When the cartridge is fired for just a fraction of a second the brass swells & "sticks" to the chamber.... when you have an oiled cartridge or chamber the brass does not "stick" so you have MUCH more pressure transferred to the bolt face, then on to the lugs & finally to the receiver....

Clean off the oil!!!

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Old January 27th, 2012, 01:56 PM   #29
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Oil in the bore will do this. Oil in the bore is an obstruction, not a lubricant.

It is unlikely that oil on a cartridge case will migrate to the bore, unless the cases are dripping wet.
Quote:Originally Posted by m14nm
I have always read that oil or any fluid in the firearms chamber can cause higher pressures. Not worth the risk.

Someone else may have a better answer or may be more knowledgeable on this.


+1 - When the cartridge is fired for just a fraction of a second the brass swells & "sticks" to the chamber.... when you have an oiled cartridge or chamber the brass does not "stick" so you have MUCH more pressure transferred to the bolt face, then on to the lugs & finally to the receiver....


I think there is a difference between being oily(leftover case lube and not totally cleaned off) and dripping with with oil either on the case or in the chamber. The oil is not compressable and essentially reduces the overall chamber volume and can elevate pressure by both not allowing the case to expand and/or provide the momentary sealing in the neck area when the round is fired. As far as the bore and chamber are concerned, it's general practice to oil it after cleaning to prevent rust so it is generally "oily/oiled" at the beginning of any shoot session??

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Old January 27th, 2012, 01:56 PM   #30
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Quote:
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+1 - When the cartridge is fired for just a fraction of a second the brass swells & "sticks" to the chamber.... when you have an oiled cartridge or chamber the brass does not "stick" so you have MUCH more pressure transferred to the bolt face, then on to the lugs & finally to the receiver....

Clean off the oil!!!
JD-

Do you have evidence of a failure due to the phenomenon described above?

I don't doubt you, I'm just looking for a documented failure. The theory is totally plausible as is the notion that the lack of friction would contribute to wear on the affected parts.

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