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Went up into the hills today to run a few rounds through my new M&P Shield 9mm. A 'few' turned out to be 50 rounds of 124gr Aguilar and 50 rounds of 124gr Blazers. When I got home, I was inspecting the empty brass and noticed a very odd stains on a couple of blazer cases - nothing on the Aguilar's. I have attached a photo and am wondering if you were any of you ammo wizards out there could identify what's going on with this particular stain. Stain is very regular around the whole case.