One of the most important tools for all reloaders !
- The tool body clamps to a digital caliper. The Cartridge headspace dial consists of 5 different sized holes to cover which will allow relative measurements of most regular cartridge cases.
- Rimless cartridge cases headspace measurements are taken from the Datum line approx half way on the shoulder to the bottom of the case head. By selecting the appropriate size hole
- on the dial which clicks into place you can obtain a ”relative measurement” of this headspace from a cartridge fired in your gun. Then by careful adjustment of the FL resizing die or a
- Bushing Shoulder Bump die you can achieve the precise ”shoulder bump” for uniformity and safety.
*Video – Forster Datum Dial
Video – ‘Ultimate Reloader’ on Datum Dial