In 30 years of reloading I hate to admit that I've had two failures to fire. Both my fault! One was in a Colt Python .357 Magnum and was because of a high primer. Fired the second time. The other was in an AR-15 in bitter winter weather. Firing pin mark on the primer was very very light. Fired the second try. Had been carrying the AR for a few hours in cold and snow before taking a shot at a target before calling it a day. Only thing found was that the firing pin and channel was dirty and oily. Probably a stiff firing pin due to the cold making the oil and dirt stiff. Learned both lessons and now make sure guns are ready for freezing temperature and that primers are closely inspected for proper seating. Both mis-fires were when I first started loading and (knock on wood) I haven't had another in the last couple decades.
Thanks to all; my problem with misfiring was that the strain screw was out a full 2 turns; after tightening the screw, had ZERO misfires today for 120 rounds; thanks again for the info!
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