Ammunition cartridge measuring for improved ballistics: Concentricity and Eccentricity

The BERSIN Ammunition Measuring and Adjustment Device is a revolutionary invention in precision shooting. The device diagnoses and eliminates errors in the longitudinal axis in rifle ammunition (concentricity flaws).

Many different types and calibers of ammunition contain concentricity flaws. Industrially manufactured ammunition generally contains errors of 4/1,000" to 20/1,000" (measured in the region of the projectile’s tip), although flaws of up to 40/1,000" can also occur. A shot at a distance of 300 yards with such a shell will forcibly miss its target by up to a foot due to the provoked rotational imbalances.

Even carefully reloaded cartridges may easily display errors of several 1/1,000", often caused by minor errors in the reloading process, such as a slight misalignment of the projectile during its insertion in the case mouth or the variation in cartridge neck wall thickness. The BERSIN device generally allows the detection and even reduction of these errors to under 1/1,000" (0.025 mm). In reloaded high-precision ammunition produced with the most recent highly sophisticated reloading equipment, the targeted 0.001" accuracy can be controlled and will be improved to within a few 1/10,000".

The result of measuring and adjustment of the rifle cartridge is a much smaller group size.