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I have found some 357 Sig cases that seemed to have a network of fine cracks in the shoulder area. They were nickled cases, so I suspect that they were too hard and had been fired in a chamber that allowed the shoulder to blow forward when fired.
Those cracks were not so obvious that somebody who just puts slightly dirty brass into a progressive wouldn't be able to miss seeing them in the usual powder smudging on a case. But,if you clean your cases and then actually look at them individually, you should be able to reliably notice those cracks with normal eyesight and decent light.
SL1
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