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Does that mean the groups ar zero MOA without your margin of error?
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No, it means that if I switch brass batches, I don't have to adjust my scope to get it on target. No perfection is implied, and if all my shots went in one hole "literally" I would show the target to prove it.
When I switch from Lapua brass, to Winchester, or Federal, the point of impact can vary slightly, due to case differences.