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    Different Headspace Measurements on Lapua 6.5 CM

    Having some difficulty understanding why one lot of my Lapua brass has a different headspace measurement than another lot. Every lot I've ever measured of Lapua 6.5 cm is 1.5580 before bumping shoulders Newest lot I have measures 1.5680 before bumping. Same gun. Bumping .002 Thoughts? Thanks...
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