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A round ball has a BC of 0.
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Not true.
From Lyman's Black Powder Handbook
.350 round ball BC .049
.440 round ball BC .062
.495 round ball BC .070
.535 round ball BC .075
.562 round ball BC .079
.735 round ball BC .104
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Ballistic coefficient is a projectile's relative ability to overcome drag as compared to an "ideal projectile".
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Actually it's a "standard" projectile which is a small 1 inch diameter cannon bullet. Notice how the round balls BCs are higher with larger diameter? It's very likely that the bullets shot from 16 inch naval guns have BCs considerably higher than 1.00.