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Old October 20th, 2019, 02:32 PM #1
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Ammo corrosion

Howdy all,

I've moved from .40 to 9mm and have a stockpile of .40 ammo. A young friend mentioned he needed some more 40, so I told him I'd let him have as much of my excess as he wanted - cheap.

This PMC .40 165gr has been in my basement for close to 20 years, and upon inspection the cases show some corrosion (see pic).

I don't know what, if any, problem this level of case corrosion pose, and I don't want to sell or give this stuff to a friend if there might be issues.

I'd like to hear from the experience and wisdom of MDS.

Thanks in advance
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Old October 20th, 2019, 03:13 PM #2
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That doesn't look like corrosion at all. It looks like it's just lost its shine.

I've shot lots of surplus that had real corrosion. The CMP used to sell surplus .30-06 that had stripes of brown or whitish corrosion running lengthwise down some cases.

I've got a bunch of surplus 6.5 Swede that would send you screaming on down the road, yet it shoots fine.
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Old October 20th, 2019, 03:15 PM #3
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I wouldn't worry about it, looks ok to me.
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Old October 20th, 2019, 04:49 PM #4
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I wouldn’t lose any sleep over it.
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Old October 20th, 2019, 04:51 PM #5
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No issues with that ammo. Tell your friend to fire away.
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Old October 20th, 2019, 05:00 PM #6
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Quote:
Originally Posted by Ammo Jon View Post
I wouldn’t lose any sleep over it.
But would you discount it?
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Old October 20th, 2019, 07:59 PM #7
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Quote:
Originally Posted by sundazes View Post
But would you discount it?
For you, no.
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Old October 20th, 2019, 08:24 PM #8
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That's just a little tarnish; no big deal. Corrosion would be green.
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Old October 20th, 2019, 09:36 PM #9
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Wait until you fire 8x56mmR WW2 era ammo. Looks fine but can infrequently rupture it's case. Like a black cat firecracker going off in your face.

Wear my safety glasses and a ballcap when firing my Mannlicher M95/30 rifles. They're a hoot

Truth be told, you can't judge the integrity of old ammo from the outside.
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Old October 20th, 2019, 09:37 PM #10
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You get that kind of tarnish for several reasons. If you store your ammo in plastic containers that gas over time, or near a water conditioner, or your humidity is a little high. It doesn't hurt anything and is perfectly safe.
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