Originally Posted by squirrelduster
Had a strange experience at the range today.
Working up drop charts for my 6.5x.284. Berger 140 gr. 2930 fps through them chrono during load work up, no chrono today.
Shot a golf ball sized rock at 100 yards to verify zero.
Target at 500 yards.
Dialed in 8.5 minutes from my iPhone ballistics app.
Dialed down to 7.5 MOA
Dialed down to 6.5 MOA
Perfect elevation. 3 inches to the left due to wind. Compensated and the next two were 1/2" apart. My deer rifle really shoots.
My question is, to get the drops correct the velocity needs to be 3250 fps. I have never had to change my velocity this much.
Anybody else seen this?
What direction was the wind coming from and was it level, rising, or falling ?
If your scope is dead on you might want to try adjusting your BC. Remeber BC's are not static, as velocity drops off so do BC's. The BC's we get from the factory specs are essentially averages based on what ever ranges they are testing the bullets at or based on what a computer program spits out.
Your Chrony, Scope, Rifle may all be dead on but the BC a bit low for the velocity you are running at the muzzle.