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salukipv1

04-16-2008 09:32 PM

Sectional Density?

Is sectional density = mass / diameter?

or SD = mass / area ?

skeeter 7MM

04-16-2008 10:02 PM

RE: Sectional Density?

Equation forcalculating Sectional Density (SD):

7000 x (bullet diameter in inches) x (bullet diameter in inches) =X
Y= (bullet weight in grains)

Y divided by X = SD

ie: .308 180gr bullet

7000 x .308 = 2156
2156 x .308 = 664

X= 664
Y = 180

180
664

= .271 SD

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