Drag variability is not a new concept, but it has lacked defining information compared to other metrics such as velocity variation, dispersion, bullet drag, or BC.
In simple terms, drag variability can be understood as the shot-to-shot variation in bullet drag. Just as muzzle velocity varies shot to shot, so does the specific drag of each bullet. Differences in drag will result in different rates of velocity loss as the bullet travels to the target. Although the distance to the target may be the same, these differences in the rate of velocity loss will alter the time it takes each bullet to reach the target. Variance in time-of-flight results in variable amounts of time exposure to gravity and wind, increasing long range dispersion