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On the rounds that did not fire, are there any contact marks on the primers. You might have a worn firing pin, or someone may have "filed" to much off the tip. Some shooters had trouble with "slamfire", using civilian ammo with soft primers. The trick was to ever so lightly file back the tip of the firing pin. Maybe get a replacement firing pin and go from there. My rifle is all original, I shoot factory and my own reloads and have never experienced that problem.
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