Choose the appropriate bullet of your gun type for the ballistic coefficients.
Bullet Name
Diameter inches
Weight grains
Sectional Density
Ballistic Coefficients
.308 dia. 180 gr. SBT
.308
180
.271
.501 @ 2700 fps and above .506 between 2700 and 1700 fps .505 @ 1700 fps and below
For your convenience, here are Adobe Acrobat PDF versions
of both the Rifle And Handgun Ballistic Coefficients, that you can download
and print out to update your manual or use as a reference.