Is it from your own rifle or a spent brass range pick up? What type of rifles? Factory ammo or reloaded? What does the brass look like after you resize it?This came from where I work. We care rifle around with breach blocks in them so I’m now wondering if those blocks caused some sort of damage in the chamber area in some of the rifles. We shot I think 8 rifles from shift on thrusday. I think I’m going to avoid those pieces of brass and scrap them. Thanks for everyone’s input.