Ok, here now a bit more comprehensive -
Cartridge .308 Win.
Rifle Savage 10 PH 20" Barrel
Suppressor ASE Utra Jet Z - Compact
Bullet LOS HT 140 grains - no BC supplied
Near velocity: 868 m/s (SD 8.4 m/s)
Far velocity: 780 m/s (0,58 m/s for only three shots)
Chronograph Pro Chrony
JBM calculates a G7 BC for these numbers of 0,152.
Just for giggles - I want to use the Litz - Formula to calculate this bullet and see if I can get close. So far no such luck. I do not seem to be able to get it right.
The formula you find attached.
What are your near and far distances for those velocity measurements? Can't calculate b.c. without that. Atmospheric data measured at the same time as the velocity readings is necessary as well (temp, pressure, altitude, etc, or density altitude).
Good luck measuring a bullet accurately enough to get a meaningful result from that formula. If you're a machinist or other occupation with specialized measurment tools, maybe, otherwise it'll be entertainment only and not accurate enough.
