Seems I found the fly in the ointment. I recently purchased 5 boxes of Norma Tactical .223 Rem, 55gn FMJ advertised @ 3240fps. $6.49 a box. I wasn't really concerned w/speed and I figured they would group good enough for plinking, crows and any other flavor or vermin that ventured on to my property. Bonus: Norma brass!
I was bit surprised and disappointed when the first one snapped. To get a five shot average over the LabRadar I went through seven rounds. Five fired, two didn't.
Thinking it could be my rifle, a Marlin X7VH, I let a bud try some in his R700 SPS; same thing. Out of the first box (20rds) 6 did not go off. Primers all struck, impact looks same as on those that went off. Two different rifles.
The box states, "Highly Reliable. Proudly made in the USA".
Luckily, I wasn't peering through the scope at a Boone and Crockett class feral cat or crow.... :{)