Black soot build up on case heads

DUSTY NOGGIN

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Mar 18, 2015
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salt lake city
doesnt look like soot to me
.. im guessing something in your tumbling media . interacting with the brass

primer looks very flat to me..

if Smith worked up load with Peterson brass. that powder charge doesnt apply to the ADG brass .. no Peterson brass available ??? why the change
 

Coldfinger

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Feb 20, 2020
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NY
Anyone ever get it? And what causes it? I’ve been getting decent build up on some cases but not all. Tried multiple primers and same thing. It’s happening on a 7 Saum with ADG brass and reloader 26.
I had it happen after a freshly blued action and bolt. The blueing transfer is onto case head after firing, still happening after 100 rounds
 

djfergus

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Dec 25, 2015
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I believe it's coating coming off of your bolt face. I've blown Primers out in the past. You will definitely know it if gas leaks past the primer.
 

djfergus

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Dec 25, 2015
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it's nitrite coated, is that known to come off?
I can't say for sure but I know that metal from the bolt face itself will erode. So I would say that the nitride couldn't be and more durable than the metal itself. If your primer is leaking, it will have a lot of soot directly around the primer more so than the outside face of the brass head.
 

BigJake91

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Jul 15, 2020
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Oregon
Anyone ever get it? And what causes it? I’ve been getting decent build up on some cases but not all. Tried multiple primers and same thing. It’s happening on a 7 Saum with ADG brass and reloader 26.
I had something similar happen with 223. I came to a conclusion of choice of powder. And not enough powder. Starting up work loads I have only ever seen it on the low charge end of the spectrum. I am no expert. But I changed primers and cases. So I suptracted 10% Starting charge and got that on my 223s. hotter I got it went away. I always end up in the middle for cartridges like 223. But that is my experience
 

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