Thread: Changing ballistic info to match "real" drop.

Most calibrations change the Muzzle velocity (MV) and this is what i would tinker with if I was you.

Below is from the AB manual for the AB MObile App.

"The ballistic calibration feature allows a user to calibrate the ballistic solution based on observed bullet
drop at range. There are two parameters that can be calibrated: muzzle velocity (MV), and drop scale
factor (DSF). The Ballistic Calibration Screen is available from any screen via the Android Action Bar.
Due to uncertainties involved with modern chronographs, velocity measurements are not always as
accurate as we would hope. Therefore the first variable a shooter should attempt to calibrate is muzzle
velocity. The recommended range for muzzle velocity calibration is where the bullet is at Mach 1.2 in its
flight. If you have multiple 'observed' data points, use the farthest high confidence data point available
MV Calibration DSF Calibration DSF Table

for muzzle velocity calibration. The interface will provide recommended ranges range in which to
calibrate muzzle velocity based on the bullets remaining velocity. After you've entered the observed
range/drop pair, the application will automatically calculate the adjusted muzzle velocity and the
application will display the actual MV that results in your observed drop. Click Use MV and the calculated
MV will be applied and the elevation and windage shown at the top of the screen will be automatically
updated.

For long-range shooting, the drop scale factor (DSF) is used to refine the ballistic solution in subsonic flight
using a similar process. By firing rounds at long range, and noting the true drop, a drop scale factor is
computed. Clicking Use DSF populates the DSF value and Mach number into the View DSF Table
Viewing the DSF Table By scrolling down, the full DSF table is presented based upon all DSF values that
have been calculated and saved. The table can be cleared by clicking on the Clear DSF button. "

Shooting a tall target will show you if your scopes mechanical clicks actually are 1/4 moa. If they are not you can input this value into the application for example: 4 clicks might equal .95 MOA.

In short adjust your muzzle velocity until it matches up or shoot at all the ranges you want to shoot game at then measure the actual drop at each distance and write it down to determine a range card.

clear as mud?