4DOF Axial Form Factor and Optical Chronographs

[Magnetite]

My specific case is I have a Caldwell Ballistic Precision Chronograph (optical), and I'm going to true with 4DOF's axial form factor (AFF).

Optical chronographs aren't known for the most accurate readings. So how should I deal with muzzle velocity?

1. Use the readings from the actual shots.
2. Use my velocity which I've averaged over multiple months.
3. Forget AFF and true muzzle velocity instead.

 

[Ledzep]

When the chronograph is in doubt (i.e. not a Garmin or Labradar), I move MV to match your <600yd impacts. Do at least 10 shots at a given range on clean steel/paper.

Once you have that data pretty solidified, move out to at least 800yd, I prefer to do it at 1000-1200 if possible the move your AFF. If you have to adjust more than .05 either way you might look at a combination of MV and AFF. More/better MV and down range velocity data would definitely help make this easier but I understand it's not always possible.

 

[Magnetite]

Thanks for the advice.