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I believe, the belief is if they weight more, they have more volume, which effects pressure. You want to be consistant. Filling with powder, then measuring powder would take forever. Some champion benchrest shooters might though.
Higher end brass like Laupa or Norma, is probably more consitant. I shoot lots of remington. I have seen a difference, but I am not shooting 600 yards. My home range is 100.
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