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There is a lot confusion about chamber pressures when comparing .223 vs 5.56 x45 and .308 Win and 7.62 x 51. SAAMI measures chamber pressure at the midpoint of the case, the military measures at the case mouth. The readings are NOT directly correlated or interchangeable. Just because the SAAMI max pressure is higher or lower than the military pressure doesn't make one combination safe or unsafe. Other factors like freebore length have to accounted for.
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