Choose the appropriate bullet of your gun type for the ballistic coefficients.
.264 dia. (6.5mm) 142 gr. HPBT MatchKing
||.595 @ 2850 fps and above
.580 between 2850 and 2400 fps
.575 between 2400 and 2050 fps
.550 @ 2050 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