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Brass from the same Mfg'er is easier for "spot checks". I just grabbed a recently loaded round popped it on the scale and weighed it. Then took another and it was almost 3gr different. I Freaked (I was using 4.3gr of Universal) . The brass was all different mfg'ers, but It looked to me like a I missed the powder in this round. Took out the bullet puller, emptied the powder and it was right on the money. I couldn't believe the cases varied by that much.
Having all the same brass, from the same Mfg'er, makes it easier for spot checks. They should not vary, but not by more than 1.5gr.
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