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It's not commonly known, but BC can and does vary - even with the same bullet.
Slight variations in shape, weight or concentricity can change the BC of a bullet between lots. So can the effect of the gun's rifling! Bullets that get deeper or more pronounced grooves cut into them by the rifling will have a slightly greater drag.
So it's not surprising that the tested BC of ostensibly identical bullets can vary by a small amount.
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