10/05/2023
Tech_Tip: Ballistic Truing
The term "ballistic truing" - matching your ballistic solver output to your live fire results - may be necessary for your rifle/bullet combo. However, many people "true" their profiles incorrectly and this is usually due to truing at too short a range or changing the wrong parameter.
Truing requires that you calibrate either muzzle velocity (MV) or Drop Scale Factor (DSF) at specific ranges. Done correctly, you will keep your rifle solutions on target and as consistent as possible. Here are the guides for which parameter to adjust based on the remaining velocity of the bullet:
At Mach 1.2 - Use Muzzle Velocity Calibration (Cal MV)
At Mach .9 - Use DSF Calibration (Cal DSF)
For example, a .292 G7 BC 6mm projectile starting at 3,000 fps, requires muzzle velocity to be trued at approximately 1,200 yards and DSF at approximately 1,600 yards! Truing at ranges shorter than those shown can lead to errors at longer ranges.
The lesson: Make sure you understand the truing sequence and ranges for truing MV and DSF, or else you could bake in error to your solution.
