The Evolution of Ballistic Calibration
- Rich Wagner
- May 12
- 2 min read
The Evolution of Ballistic Calibration by Bryan Litz
[Abstracted from the full article above.]
When a modern precision shooter engages a long range target with a rifle shot, the ballistic
trajectory is first computed, accounting for: distance, gravity, wind and other variables. For
relatively short range shots on big targets, it’s easy to achieve sufficiently accurate inputs for the ballistic profile. As the distance increases, there’s more demand for the ballistic profile to be accurately characterized. At some range, the fire solution becomes so sensitive to errors in the ballistic profile, that it becomes necessary to incorporate some feedback from actual shooting. This feedback can be used to calibrate the ballistic profile, so the solver predicts the real world trajectory. There are several variables that can be calibrated, and the goal of this paper is to convey the thought process for determining which variable to calibrate within your ballistic profile.
Garmin Xero radar chronograph
and others like it have changed the
uncertainty landscape in ballistics
Conclusion
Legacy ballistic calibration anchored on Muzzle Velocity (MV) as the most impactful variable
to calibrate ballistic solutions because of the historic uncertainty with that variable. Recently, the state of the art in chronograph technology has improved, and it’s now common for shooters to have real time accurate MV data while shooting long range. With MV being defined accurately, the next biggest error source is potentially with the bullet drag models in the software not matching the users specific equipment. Due to this shift, a new way of calibrating a ballistic solution was developed to alter the BC/CDM of the bullet so the predicted trajectory matches reality, when using MV data from an accurate chronograph. By enabling shooters to calibrate the right variables, ballistic solutions extrapolate more accurately to ranges beyond where the calibration was fired.
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