https://www.sierrabullets.com/products/new.cfm

Dia. Weight Sectional Density B C and Velocity Ranges
0.308 168 .253 .535 @ 2050 fps and above
.521 between 2050 fps and 1650 fps
.480 @ 1650 fps and below

0.308 175 .264 .545 @ 2400 fps and above
.530 between 2400 and 1800 fps
.495 @ 1800 and below

"Every record has been destroyed or falsified, every book rewritten, every picture has been repainted, every statue and street building has been renamed, every date has been altered."
― George Orwell, 1984