Choose the appropriate bullet of your gun type for the ballistic coefficients.
.500 dia. (50 cal) 350 gr. JHP
||.155 @ 1775 fps and above
.158 between 1775 and 1620 fps
.169 between 1620 and 1470 fps
.177 between 1470 and 1300 fps
.188 @ 1300 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.
Adobe Acrobat PDF of Ballistic Coefficients