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Old February 14, 2012, 08:17 PM   #5
William T. Watts
Senior Member
Join Date: January 20, 2010
Location: Central Arkansas
Posts: 1,069
Sounds like the factory loaded that lot to hot, it's not unusual to find WSM factory ammunition loaded so heavy the primer pockets open on a single (1st) firing. CCI & Federal primers are a full .001' larger (.211") than R-P and Winchester primers (.210". William
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