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