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Old July 17, 2012, 11:58 AM   #23
Mike Irwin
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Join Date: April 13, 2000
Location: Northern Virginia
Posts: 35,699
I had loads worked up for my modified .243 that would cut 1/3" groups at 100 yards all day long.

I switched out the primers for CCIs one day because my gunshop was out of the ones I normally used (Federal).

Groups opened up to well over an inch.

When I went back to Federals, my groups shrank back to where they should have been.
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