Tuna is absolutely correct about this. Check the case length on your cases I bet you will find the ones that misfire are short. I was able to buy a carbine with the same problem. I found the answer when I test fired. Apparently when the rounds were chambered the brass slipped forward and though the primer was struck it was lightly struck and did not fire. Some of the discount manufacturers used short brass. Try standard factory loads or brass and you will find a difference.
Question on M-1 carbine misfires
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occaisional no-fires
I had a problems with random non-firing 20 ga shotshell reloads. I was using a single stage MEC JR. press, where each primer must be individually placed in the primer cup by hand. 'Sent primers back to Remington and they said that the propellant was wet, with water. The condensation from my beverage glass! ---to make a long story short... Ever vigilant ! Geoff in DEComment

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