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Sectional Density
Sectional Density is a value that relates the ratio of the density, or weight, to the cross-sectional area of a bullet.
The Weight of a bullet, in pounds, is divided by the diameter squared of the bullet.
Weight in grains = G
Weight in pounds = P
Diameter in inches = D
Sectional Density = SD
P = G / 7000
SD = P / D / D
A 250 gr. bullet of 0.454 diameter has a Sectional Density value of.
( 250 / 7000 ) / .454 / .454 = 0.1732 = SD
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