Earlier this week I went to the range with a LabRadar chronograph, my SKS, and a bunch of corrosive Norinco 123gr 7.62x39 ammo (steel core, copper washed).
One cool feature of the LabRadar is that it can report the projectile velocity at multiple points along the way. One of the hardest parts about calculating the BC is that you need the velocity from two known points.
Anyway, between my phone (for location & altitude), the internet (to lookup the weather conditions that night), and the LabRadar I calculated the BC of the projectile (using the JBM calculator). Figured best to share - maybe someone out there will find this helpful/useful.
G1 BC: 0.266
G7 BC: 0.131
Average Muzzle Velocity: 2451fps (12.7fps standard deviation)
I'm more than happy to share the data if anybody is curious or wants to check my numbers.
One cool feature of the LabRadar is that it can report the projectile velocity at multiple points along the way. One of the hardest parts about calculating the BC is that you need the velocity from two known points.
Anyway, between my phone (for location & altitude), the internet (to lookup the weather conditions that night), and the LabRadar I calculated the BC of the projectile (using the JBM calculator). Figured best to share - maybe someone out there will find this helpful/useful.
G1 BC: 0.266
G7 BC: 0.131
Average Muzzle Velocity: 2451fps (12.7fps standard deviation)
I'm more than happy to share the data if anybody is curious or wants to check my numbers.
