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  #1  
Old 06-21-2010, 11:37 AM
walterj61550 walterj61550 is offline
 
Join Date: Nov 2009
Posts: 13
Default FYI on AYR Chart

After reading all of your posts: This is what you reported!

AYR 7 55 Non corrosive
AYR 9 ?
AYR 10 55 Non corrosive
AYR 11 55 Non corrosive
AYR 12 55 Non corrosive
AYR 14 55 Non corrosive
AYR 21 55 ?
AYR 23 55 Non corrosive
AYR 27 55/56 ?
AYR 28 55/56 Non corrosive
AYR 29 55/56 ?

if you have any more information please add to this post and I will update it so it can be printed out for convience.

Last edited by walterj61550; 07-20-2010 at 10:46 AM. Reason: update
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  #2  
Old 06-21-2010, 11:40 AM
walterj61550 walterj61550 is offline
 
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can we make this a sticky
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  #3  
Old 06-21-2010, 11:41 AM
Keymaker Keymaker is offline
 
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Location: Mid-Michigan, USA
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This is too good to be true!!! Apparently I missed the posts about these lots being non-corrosive (but willing to take your word for it).

Thanks for this post Walter.
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  #4  
Old 06-21-2010, 11:43 AM
walterj61550 walterj61550 is offline
 
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Keymaker it took a while to read each report and I am just trying to make it easier for all of us!
Just hope we can add to this with accurate information!!!
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  #5  
Old 06-21-2010, 11:50 AM
ksuguy ksuguy is offline
 
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Location: Kansas
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Anything on 7 and 9 yet?
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  #6  
Old 06-21-2010, 11:56 AM
TokiWartooth TokiWartooth is offline
 
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Location: New York
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Is this confirmed by Roelfson, or whoever took that company over? I would be hesitant to say its all non-corrosive...
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  #7  
Old 06-21-2010, 11:59 AM
Perplexed Perplexed is offline
 
Join Date: Mar 2010
Location: Oklahoma
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Be advised that the "not corrosive" reports each were based on the results of firing one or two primed cases, some with controls, some without. It's risky to assume that an entire run or even a specific lot of AYR is not corrosive based on those few observations. Given that most of us don't have access to a wide range of AYR lots, or the time or wherewithal to conduct a more statistically sound test, it's prudent to assume AYR is corrosive.

Now, if NAMMO, the parent company of the Raufoss ammo manufacturer, comes back with documentation showing that the AYR is not corrosive, we can celebrate. Until then, I'm using Windex in addition to the usual suspects to clean my M1's and 03A3's
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  #8  
Old 06-21-2010, 12:31 PM
gpw9552 gpw9552 is offline
 
Join Date: Oct 2009
Location: Mesa, AZ
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Based on the results so far, I doubt that any of the AYR is going to be corrosive primed.

1. It was US contract ammo
2. Raufoss was a large company and manufactured to specification. Not your typical home reloader with 5 different primer types laying around. And yes, I fit that discription. I have primers from the late 40's.
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  #9  
Old 06-21-2010, 03:34 PM
HANDYMAN HANDYMAN is offline
 
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Location: Vermont
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Quote:
Originally Posted by gpw9552 View Post
Based on the results so far, I doubt that any of the AYR is going to be corrosive primed.

1. It was US contract ammo
2. Raufoss was a large company and manufactured to specification. Not your typical home reloader with 5 different primer types laying around. And yes, I fit that discription. I have primers from the late 40's.
+1 that was my thoughts exactly if we switched to non corrosive why wouldn't they.
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  #10  
Old 06-21-2010, 03:41 PM
Arcane Arcane is offline
 
Join Date: Oct 2009
Posts: 184
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The news that the AYR AP is most likely not corrosive is indeed good news but some the ammunition still appears to have a few attributes that are less that ideal.

My own test on AYR 23 55 turned out negative on corrosive primers. However, after pulling the bullets from 384 rounds of AYR 23 55, I can tell you that all of the cases showed corrosion inside the case. One third of the cases were not so bad and two thirds of the cases were moderately corroded. Why they are corroded, I haven’t a clue. The powder resembles IMR 4895, it was free flowing and not clumped. I do think that the ammunition would still be safe to fire. Since the case walls of military brass is much thicker than commercial brass

Since the majority of my AP will be held for the use of my sons and grand kids, I will not store the AYR ammunition for an extended period as it is. I will pull the bullets and reload them into clean boxer brass with new powder. Even though I would shoot the ammo today, keeping it in long-term storage is out. The longer the corrosion is allowed to work on the case wall the more problematic it will become.

Different lots may not have the corrosion inside the case; it may only affect some of the lots. The only way to tell if the corrosion is there is to pull the bullets from several rounds at random and check them, because they all look fine from the outside.

Last edited by Arcane; 06-23-2010 at 12:16 PM.
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