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Old September 16, 2012, 02:07 PM   #31
Brian Pfleuger
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Join Date: June 25, 2008
Location: Central, Southern NY, USA
Posts: 18,578
I do wonder if the unusual shape of the Glock firing pin might contribute to the issue.
Some of the Federals I have are match primers, I think it's the magnums but I'm not positive.
I'll check later.
I'll have to run a test again and show what happens. IIRC, I was piercing like 1 of 4 or so at low levels and increasing to nearly all at mid-range loads, which is where I stopped.
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