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| Author | Comment | ||
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 HalfCocked |
Question about 7.62 x 54r Modern Ammo . |
Lead | |
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Posts: 5 (11/23/09 03:06 PM) |
I have a few boxes of Brown Bear brand ammo, and it is Berdan primed. Is this ammo corrosive ammo? The reason I ask is that I have handloads from Winchester
Brass and bullets and I consider them to be non-corrosive.
The company is an imported Russian brand with no US contact information on their site. Thanks |
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NotPC |
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Posts: 5559 (11/23/09 04:50 PM) Host |
Does the box mention if it is non-corrosive? Do you trust the box label? Some Berdan-primed ammo is non-corrosive. The corrosive factor comes from the type of
primer compound used.
Here is more info on modern ammo: http://www.7.62x54r.net/MosinID/MosinAmmo.htm |
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Patt14 |
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Posts: 16 (11/24/09 10:26 AM) |
Brown Bear ammunition is not corrosive.
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NotPC |
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Posts: 5562 (11/24/09 12:27 PM) Host |
Patt14 wrote: That sounds like a declarative statement of absolute fact. I'm suspicious of foreign labels and anecdotal "evidence". What degree of corrosiveness is allowed before it can be declared "non-corrosive"? I don't know - and standards vary between countries. Do you have test results from reputable U.S. labs? If so, please share that with us. Regards. |
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Patt14 |
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Posts: 18 (11/24/09 12:37 PM) |
I tested a box using flat steel plate. I degreased and ground two pieces. On one I fired the primer from a pulled round and the other I used as a control
piece. After five days I saw no evidence of rusting or any difference in either of the plates. Had the ammunition been corrosive, I should have seen some
indication of corrosion in the non-control plate.
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NotPC |
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Posts: 5563 (11/24/09 01:04 PM) Host |
"I tested a box using flat steel plate. I degreased and ground two pieces. On one I fired the primer from a pulled round and the other I used as a control
piece. After five days I saw no evidence of rusting or any difference in either of the plates. Had the ammunition been corrosive, I should have seen some
indication of corrosion in the non-control plate."
That is a good indicator, similar to the "bullet test" for muzzle wear - but it is not 100% scientific or definitive. Was there enough time and
humidity to guarantee an absolute repeatable scientific result? Was there any microscopic trace of corrosion. Do you have access to an electron microscope?
I prefer laboratory controlled results and until I see them from somewhere reputable I will continue to clean bores as if they are corrosive - regardless
of advertised claims of "non-corrosive". There are different rates at which corrosion sets in. Steel may look like it is all the same, but it is
not. Depending on the nickle and/or chrome content of the steel that you used for a "control" surface, corrosion may be retarded or non
existant. Do you know the EXACT formula of the steel alloy that you used? You would not unless you had a manufacturer's spec sheet of the lot. Lacking
scientific proof, I continue to be skeptical and will "err on the side of caution". I just want to know the factual truth of the matter. Anyone
know?
I see flaws in your analysis. You assume that you have steel that is subject to corrosion from whatever primer compound is there. You assume that you gave it the time necessary to corrode. Five days may or may not be enough. Was 100% of the same amount of burned primer mixture used on the plate(s) as would be in a barrel? Quantity matters. How many rounds from how many lots of ammo were used in total? Regards.
Last Edited By: NotPC
11/24/09 01:35 PM.
Edited 3 times.
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Patt14 |
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Posts: 19 (11/24/09 01:47 PM) |
Let me back up and state that I am not a scientist, metallurgist, or chemist but I do not believe Brown Bear to be corrosive based upon my experience
with it. Maybe my statement that "Brown Bear ammunition is not corrosive" was too definitive and spoken without professional scientific proof. I
personally don't mind shooting any corrosive ammunition because I clean my rifles well after all shooting sessions whether using corrosive or non-corrosive
ammunition as you also stated. Thanks for the discussion.
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NotPC |
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Posts: 5564 (11/24/09 01:56 PM) Host |
And I also shoot foreign ammo marked "non-corrosive". I just do not give the label the same credibility as I would American-made ammo. Maybe you
don't either.
 We both are diligent about the care of our rifles and that is what really matters. Take care, sir. Regards.
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 m1 talker |
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Posts: 7109 (11/24/09 02:39 PM) Veteran member |
I can well remember a few years ago when Wolf was sending a lot of 7.62X39 ammo to our shores. It was supposed to be non-corrosive, but they made a mistake
when loading it and used some older corrosive primers. The boxes said non-corrosive on them, but it was just as corrosive as the Yugo stuff. Never depend on
what a box may say on it. It only adds a few seconds of time at the range to make 100% certain to take care of any possibility of the ammo being corrosive.
It is not worth argueing about. Heck, I even clean for corrosive when I am shooting modern US made ammunition, like .30-06 in my 1903A3's! Just a habit, and a good habit to have. Curt |
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zeebill |
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Posts: 3843 (11/25/09 08:14 AM) |
NotPC wrote:Wow is that ever a mouthful!!!! I treat all ammo to be corrosive and worry not then! Primers are very variable in imported ammo and that can be a big problem so err on the side of caution I would say! Bill |
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