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Bosquebrass wrote:
I found these in a sack of range brass ... mixed bag of different brands and the only pieces that have been this way so far are Winchesters.
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This failure has nothing to do with the brand of the brass.
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I don't ever look at 9mm brass for bulges, much less blowouts,...
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Without meaning to sound flippant, you should check every case for bulges and other signs of being out of specification or imminent failure. Don't know if anyone was hurt or their gun damaged by these failures, but they very well could have been.
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What could have caused this?
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The bulge around only a part of the diameter near the head suggests that the cases were fired in a gun with an unsupported chamber.