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I have never had that problem but I have never messed with .380 or 9 mm stuff. I have bought a little bit of range brass for .357 and .44 mag and .45 LC and never encountered the problem. Mostly though I prefer to buy new brass if I decide I need more stock. That way I know the entire history of that case. If possible, I also try to just stick with one brand of brass for a given caliber to avoid problems like different brass thickness or lengths.
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