Norma .223 brass weighing differently between lots

[Chris_MI]

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 happened? Did Norma change up the alloy? Did they thin the cases?

I'm wondering before I go theorycrafting if anyone is aware of any changes they made over at Norma.

Thanks in advance!