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Old March 16, 2013, 07:06 AM   #12
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Join Date: January 27, 2010
Location: Norfolk, VA
Posts: 2,905
I didn't know that CCI #41 were magnum primers. I was under the impression that they just had a harder cup to prevent bump fires with the free floating firing pin in AR 15's.
It does have a harder cup for the reason you gave, but the CCI #41 (and the large rifle equivalent, #34), are also magnum primers.

From the CCI page on #41 and #34:

"Use the same data as CCI Magnum primers"
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