How long does it take for corrosive ammo to rust a barrel? - Gun Hub
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Old 09-01-2004, 06:00 AM   #1
M38
 
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How long does it take for corrosive ammo to rust a barrel?

I'm reading a book about a private in the 94th division. He was a relacement and went into combat as soon as he got to the front line in January 1945. In that action he wasn't able to clean his M1 until days after he first fired it. Which makes me wonder how long it took corrosive ammo to damage the barrel. Is it like blackpowder and rusting begins with in 24hrs?
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Old 09-01-2004, 06:06 AM   #2
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Yes,but not to as great a degree. It usually takes a week or so to get a real good surface coat of rust in a barrel and about another week to start pitting. That would change in a low humidity area or a hight humidity area but applies pretty well here in Va. Still,clean it well and quick. In WW2 they had millions of replacement barrels and didn't care if one got a little pitted during long periods of combat. TJR
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Old 09-01-2004, 06:34 AM   #3
 
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The best thing to do is keep a boresnake and a bottle of Windex with all your shooting gear and as soon as you fire your last round of the day flush out the barrel with Windex and run the boresnake through it a few times.

I also lock the bolt back and spray down between the OP rod and gas cylinder and the bolt face.

This only takes a about a couple of minutes and it allows you plenty of time to get around to giving it a proper cleaning.
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Old 09-01-2004, 06:43 AM   #4
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depends on the humidity........the salts from the primer acts like a sponge absorbing the water in the air and that is what causes the rust......and then the rust causes pitting. I fired known corrosive ammo while I was stationed at Ft. Carson, Co (colorado springs) and went for at least a couple weeks before I touched my rifle to clean it, and there wasn't any indication of rust in my AKM.........now Ft. stewart, ga was a different story....started to rust within 24hrs
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Old 09-01-2004, 07:21 AM   #5
 
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Also, you are not considering that he was firing the rifle at frequent intervals. The corrosive salts have to be left undisturbed to attract moisture and then react with and rust the barrel.
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Old 09-01-2004, 07:47 AM   #6
 
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Humity is the key. I live in Colorado Springs and the humity is really low most of the time. I have shot Denver 43 ammo and left the M1 for a week before cleaning and there is no visible rust anywhere. I,m not recommending leaving a rifle this long but I just forget it.
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Old 09-01-2004, 06:10 PM   #7
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You have a while in southern CA before you have to worry about rust. I let my Mosin Nagant sit for 2 days before cleaning it and no rust from old commie ammo. Now if you lived on the coast or in a humid state look for rust in a matter of hours.
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Old 09-05-2004, 08:05 PM   #8
 
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Quote:
Originally Posted by Cornbread2
...flush out the barrel with Windex and run the boresnake through it a few times. I also lock the bolt back and spray down between the OP rod and gas cylinder and the bolt face.
Dear Cornbread,

Don't you have to get inside the gas cylinder as well? I just got some KA ammo and was wondering about that. Thank you. Stay safe, Gary
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Old 09-06-2004, 10:35 AM   #9
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the gas cyl is stainless. the op rod is not, so pull the op rod back all the way and clean it up to the piston.
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Old 09-06-2004, 05:50 PM   #10
 
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Quote:
Originally Posted by GW Trott

Don't you have to get inside the gas cylinder as well? I just got some KA ammo and was wondering about that. Thank you. Stay safe, Gary
Yes you have to clean the gas cylinder. It will still rust no matter if it is stainless.

The windex just gives you a little time untill you get home and give the entire rifle a proper cleaning.
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