Kelbro
I do not claim to be anything near an authority on reloading, but I have done a lot of it. From the info you gave, I don't see where the problem may be.
That makes me think the problem is with the info you didn't give.
Such as, what kind of rifle are you shooting? What type of powder, and how much of it, were in that "first 8 loads"? Were the "once fired" cases fired in the same rifle both times?
Sorry I can't give you a definitive answer, but there are so many variables
in reloading, it usually requires all the data to draw any strong conclusion.
Walter
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