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Old October 20th, 2019, 11:52 PM #11
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Fired some old(20yrs) 5.56 out of my AR up at elk neck. Fired fine-but left a smoke trail like a line from the muzzle to the target-kind of like a smoke tracer.
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Old October 21st, 2019, 07:04 AM #12
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Actual corrosion will show up a colored powdering looking deposits.

Typically green corrosion, which can be buffed or tumbled off. You used to see a lot of this when people (cops) carried spare rounds in loops on their leather belt.

If you see pink corrosion, DO NOT FIRE THE AMMO. The pink corrosion eats into the case, and can cause case failures. Much of the pink corrosion is reported in ammo that is in ammo boxes that have excess acid Unfortunately, so of the battle packs of 7.62 is like this.
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Old October 21st, 2019, 08:27 PM #13
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Fired some old(20yrs) 5.56 out of my AR up at elk neck. Fired fine-but left a smoke trail like a line from the muzzle to the target-kind of like a smoke tracer.
That's probably lead from the bullet
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Old October 21st, 2019, 08:32 PM #14
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Thanks everyone!
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Old October 26th, 2019, 03:42 PM #15
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Quote:
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Fired some old(20yrs) 5.56 out of my AR up at elk neck. Fired fine-but left a smoke trail like a line from the muzzle to the target-kind of like a smoke tracer.
Really humid day? Thatís what a bulletin trace is from. Itís vapor condensing out of the atmosphere from the low pressure wake of the bullet. Normally hard to see unless it is very humid.
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Old October 28th, 2019, 08:13 AM #16
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If you have a brass tumbler that uses corncob media or similar, just run it through that, and it'll get shiny again. There's no issue with tumbling live rounds, and it's actually sometimes helpful on older milsurp to get them a little cleaner to do a true corrosion assessment.

But, really, I'd just shoot it.
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Old October 29th, 2019, 04:02 PM #17
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Let me test fire them for you
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Old October 29th, 2019, 07:11 PM #18
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Last edited by paperwork351; October 29th, 2019 at 10:56 PM. Reason: delete post
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Old October 30th, 2019, 05:34 PM #19
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Quote:
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Really humid day? Thatís what a bulletin trace is from. Itís vapor condensing out of the atmosphere from the low pressure wake of the bullet. Normally hard to see unless it is very humid.
In designated marksman training we got used to watching the vapor trails of our tricked out M14s and M40A2s rounds. Got good enough to call the shot based on the trails.
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Old October 30th, 2019, 06:02 PM #20
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I've reloaded 40SW with brass that looked 5.7 bazillion times worse than that another twenty cycles lol..
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