There are several things that can occur during the manufacture of a primer that could lead to pierced primers. The most likely culprit, if it is in fact a fault of the primers, would be an improper temper of the strip stock used to produce primer cups. I can't imagine Olin would reduce the thickness of their strip stock to save fractions of pennies.
Many things can go wrong if the manufacture of primer components are not closely controlled with an eye on consistency.
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