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Looks to me that your are shooting 223 ammunition and I am assuming that it is fired in a gas gun.
As Bart has said there are a lot of variables with primers. I have developed loads that gave no indication of high pressures till primers started leaking or were blown. Primers are an unreliable indication of pressure, but they are better than nothing.
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If I'm not shooting, I'm reloading.
Last edited by Slamfire; February 4, 2013 at 12:23 PM.
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