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If you had chrono'd the rounds you may have noticed a larger variation in velocity too but for all practical purposes it doesn't really hurt anything, it just isn't as efficient. To me a magnum primer is only for igniting powder that a standard primer may have difficulty igniting completely, ie ball powder or cold temperatures. I could be wrong, often am but that is what comes off the top of my old dinosaur head.
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Good intentions will always be pleaded for any assumption of power. The Constitution was made to guard the people against the dangers of good intentions. There are men in all ages who mean to govern will, but they mean to govern. They promise to be good masters, but they mean to be masters.
--Daniel Webster--
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