I know that some bc measurements are more accurate than others. Looking at some of Bryan Litz's work and Sierra's numbers it would seem that bc changes as velocity changes.
example from for Lapua 155 Scenar from Applied Ballistics
fps / BCG1
1500 / .411
2000 / .458
2500 / .473
3000 / .493
Average/.459
Sierra Also lists bc's for different velocities as found on their website.
Questions:
-Do most manufacurers just advertise the bc for the higher velocity?
-Should use the average bc within the velocity range from muzzle to target when calculating or comparing drop/drift?
