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All of the pistol primers made in the USA will have a cup thickness of .017. For a Hornet where you're reaching towards max pressures, you can expect pierced primers. The problem with using a small rifle primer in the small Hornet case is that sometimes the brisance of the primer actually starts the bullet moving before the powder has time to build pressure. This creates odd pressure spikes and accuracy issues. You might try using the Remington 6 1/2 as it is a lower brisance primer more suited for the small cases like the Hornet, 218B, etc. yet has the thicker cup material.
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