Recommended Ballistic Calibration Distance is Too Far.

Another topic that gets brought up a lot is the ability to shoot the ranges needed to do a Ballistics Calibration. Do note, Ballistics Calibration, for the best results, should be done ONLY at long range. More specifically Long Range in regards to the caliber, or Mach 1.2-0.9. Remember this is system dependent. A 22LR leaves the barrel transonic, while a 338 might go transonic at 1 mile. This is in part due to error reporting, but also because of the accuracy of our test data. Bryan Litz takes great care in making sure the data collected is extremely accurate. So if you are using our Custom Drag Model data, and your firing solution is off in the supersonic range (Mach 1.2+) then the culprit is more than likely your muzzle velocity. Note: Custom Drag Models are NOT G7 BCs and are NOT Banded G7 BCs. You cannot accurately re-create the CDM by using banded BCs. While this does apply to the use of G7 & G1 Drag Models, because the averaged G7 BC is good for most velocities in the supersonic range. If your solution is off, at Mach 1.2+ then you need to calibrate your Muzzle Velocity. Keeping in mind, that sometimes the firing solution is correct, and your turrets might not be tracking perfect can also be a culprit here. For more details on this, reference Accuracy and Precision for Long Range Shooting by Bryan Litz, Ballistic Calibration Article coupled with the Chronograph Performance Review Article.

  1. AB Mobile App: You will be able to input ranges outside the recommended ranges, however it might cause problems due to both error reporting which is covered in the Ballistic Calibration Article, and the limited distance between points.
  2. Kestrel: If you attempt to do a DSF (Drop Scale Factor) at too short a distance, it will not accept multiple inputs. They must be done At Mach 1.2 – 0.9 and slower. If you need to adjust in the supersonic range, use the MV (Muzzle Velocity) Calibration.