Looking at your photos, and noting that you are using WWB, I don't think the "brass" you are seeing in the pistol action is brass at all. WWB is loaded with ball powder, and in my experience it leaves some unburnt powder particles in the action after firing. These particles are a yellow / brass color as the deterent coating gets burned off, and are very small spheres or flattened spheres. To the average shooter they do appear to be "brass" particles, but instead are simply unburnt pwder particles and are quite normal when firing ammo loaded with some types of ball powder. I see this all the time when firing my Sigs with Winchester ammo...
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