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Old March 22, 2007, 08:58 PM   #2
Join Date: March 4, 2005
Location: Ohio
Posts: 11,535
Generally, pistol primers have thinner, softer cups because they are fired at lower pressures and need to work with less powerful firing pin blows. In a high power rifle you risk the pressure popping them, or the hard striking firing pin weakening them enough to pierce. Some prefer the rifle primers for high pressure pistol loads, too, particulary if they are fired in a rifle.
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