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Old November 16, 2012, 12:11 AM   #8
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Join Date: January 30, 2009
Location: Boncarbo,Colorado
Posts: 486
Perhaps this will help? 7/64 is pretty small IMO. I would go with an 1/8" or a 5/32" flash channel.

You want at least a .005" crush fit on the primer to be blow by free. Losing all those hot gasses is what makes BH209 extremely dependable and almost flawless.
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