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Old April 22, 2012, 11:06 AM   #10
Unclenick
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Join Date: March 4, 2005
Location: Ohio
Posts: 21,022
Marc Califo,

If that information Old Roper posted is correct, these powders would be way too slow for .223 and .308. You might well be letting yourself in for secondary muzzle pressure spikes that could ring your barrel. Read starting about half way down this page.
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