With brass I'm using in the 223 Maximus, I've found a few cases have a off center flash hole. Only about 6 out of 100. I noticed some added restristance when decapping(using a Lee decapping die as the case is too long for most the decapping pin in the neck size die). I was luck not to break the pin.
Side note:
Fired a 5 shot group with the off center brass and a 5 shot group with good brass. There was no difference in the group size or the POA.
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