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Old March 15, 2013, 05:57 AM   #5
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Join Date: January 27, 2010
Location: Norfolk, VA
Posts: 2,905
Small magnum primers are not meant to be used in .223

The CCI #41 that the OP is using is a small rifle magnum primer designed specifically for military-style semiautomatics.

OP - if all you want is a plinking load, start at the bottom of the charge range and work up until the load cycles your gun reliably. That should give you something that will work, while keeping you well away from potential overpressure.
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