My pop has 3 of them 1x in .243 and 2x in .223. He has them for the "Grandkids". All of them seem to have the same issue you do. All stikes look to be good and deep, but still do not go off. I can take all the .223 and run them through my AR15 and they fire with no issue. They have been clean as well as I can and still have the issue. My dad is cool with it as he just swaps out the rounds and usually the next one fires or he can pull the round out turn it a bit and then it will fire on the second try. He got really good deals on them so he does not care too much. Good luck and I hope you find a fix.
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