The product can measure the neck wall thickness of the cartridge case to ensure the consistency and symmetry of the cartridge case, thus improving the shooting accuracy.
This manual describes the CNPG, a caliber measuring system from CS Shooting Performance that measures the neck wall thickness of cartridge cases with a dial gauge. It explains why a constant and symmetrical neck wall thickness matters for accurate shooting performance, listing benefits such as better concentricity between bullet and case, smaller muzzle velocity differences between shots, and cases that can be reloaded more often.
The document covers the components of the gauge (dial gauge with 1/1000 mm reading, hardened centering bolt, mushroom-shaped ball, caliper baseplate, system carrier and rotable casing ring), the measuring process step by step, an application example for reading wall thickness differences, and how reloaders who turn their cases can check the effective neck wall thickness.
| Dial gauge reading | 1/1000 mm |
|---|---|
| Measuring range | 0-1 mm |
| Centering bolt | hardened |
| Casing ring | rotable |
Put the case neck between the centering bolt and the ball taster, first turning the ring of the gauge to the 0 position, then read the deflection of the pointer while turning the case in small angle steps.
According to the manual, good cases show less than 0.03 mm deviation.
Set the dial gauge to 0 beforehand, then add the digits of the small pointer (0.2 / 0.3 / 0.4 mm) to the value of the large pointer.
No, the manual states it is an independent caliber measuring system and no further equipment is necessary.