Thread: Burned Brass
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Old April 20, 2013, 10:18 AM   #2
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Join Date: January 27, 2010
Location: Norfolk, VA
Posts: 2,905
I've seen similar marks on my .380 brass, as well as a few other calibers. Here's a typical shot of what the .380 brass looked like:

I'm pretty sure it's just a result of shooting relatively low-pressure loads. The case doesn't expand enough to seal completely against the chamber walls, so a little bit of the combustion gases work backward between the chamber wall and the case. Like you, I didn't see any damage to the chamber itself. Subsequently, I bumped up the powder charge a little bit, and the "burn" marks went away.
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