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Old March 8, 2012, 02:32 PM   #1
jjcbuck
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blackened brass

What is the cause of new hand loaded brass showing black residue half way down the brass on both 9mm and .45 ACP when fired.
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Old March 8, 2012, 02:34 PM   #2
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This is usually a sign of low pressure and inadequate seal of the case to the chamber wall.
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Old March 8, 2012, 02:36 PM   #3
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blackened brass

Could this be caused by too much of a crimp? I know 9mm and .45 ACP must not be crimped too much.
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Old March 8, 2012, 02:44 PM   #4
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Since these are taper-crimp rounds, I guess it's possible; but I would think that too much of a crimp would drive pressures up, not down. I don't load either of these so hopefully someone experienced will chime in.
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Old March 8, 2012, 02:58 PM   #5
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Quote:
Originally Posted by DWFan
This is usually a sign of low pressure and inadequate seal of the case to the chamber wall.
+1 That will do it.
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Old March 8, 2012, 03:09 PM   #6
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+2 on the low pressure.
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Old March 8, 2012, 03:11 PM   #7
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+3 on the low pressure. Case isn't expanding and filling out the chamber allowing gasses to blow by.
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Old March 8, 2012, 03:29 PM   #8
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jjcbuck, I am the fan of the crimp, not a real big problem but there is a limit to the effect a crimp has on pressure, I would suggest reading R. Lee;s book on modern reloading. I do not know how to advise you on your blackened cases. I believe time is a factor, in your opening post you did not list the powder, there are powders that are slow pistol powders, the same powder can be a fast rifle powder. It is not easy to load 9mm pistol ammo for the wife, it was suggested I make her angry, they said making her angry would automatically cause her to hold the pistol tighter, loading her ammo heavier does the same thing.

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Old March 8, 2012, 03:38 PM   #9
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I learned this the first time I loaded 30-06 and worked my loads up starting at the minimum charge. The cases were all black and sooty until the middle to high end of the powder charge range.
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Old March 8, 2012, 03:51 PM   #10
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Are you using Titegroup powder? It is notorious for that, but moreso with straight-sided cases like .38 Special.
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Old March 8, 2012, 04:07 PM   #11
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Thanks for the input. These are not my loads I am inquiring about. I am an RO at a local personal defense league and I noticed this blackening in his 9mm and .45 rounds. He asked me the cause and I did not know. I don't know what powder he is using or the amount. I thought I would pick a few experienced brains before I try to respond to him next week. Thanks again for your input.

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Old March 8, 2012, 07:39 PM   #12
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Yea, I just ran into that same thing (Again) working on some 9mm loads with Titegroup powder. On my loads it is defiantly to low a charge so I am going to have to bump my load up a little. I've been working a load down from 4.3 grains and made it down to 3.5 grains where the burn mark (What I call it) on the side of the case showed up. Just as information, my Walther PPS and my Springfield EMP did not cycle properly with this charge so I will be bumping up my charge a little on the next batch. I have also noticed these burn marks on cases using other powders with a low charge. Hey, what can I say it happens...
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