differently

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    Norma .223 brass weighing differently between lots

    Howdy, I have been reloading .223 for over two years now, using the same 100 Norma brass. I ordered another hundred a few months ago and another 100 just a week ago. I weigh each case and my old brass weighs around 101 grains, the two new batches weigh around 93 grains. Does anyone know what...