Forster Datum Dial body Assembly

• Relative case measurement: The Datum Dial body assembly measures from the case head to a datum point on the shoulder, helping reloaders track shoulder setback and keep sizing adjustments consistent.
• Interchangeable system design: As the core body of the Datum Dial system, it works with the matching dials so one measuring setup can cover multiple cartridges without a large collection of separate gauges.
• Simple caliper-based setup: Used with a caliper, the assembly gives fast comparative readings that make it easier to refine die setup before and after sizing operations.
• Useful for load development: Consistent headspace checks support more uniform brass preparation, which helps when chasing repeatable chamber fit and predictable ammunition performance.
• Made for bench use: This Forster measuring accessory is built for the reloading bench, where quick checks and repeatable handling matter during case preparation.

About the Datum Dial Series

The Datum Dial series is Forster’s modular case and cartridge measurement system for reloaders who want a practical way to monitor sizing results and ammunition consistency. Positioned within the company’s precision reloading range, it is aimed at handloaders who need more feedback than a simple pass-or-fail gauge but prefer a straightforward bench tool over a complicated measuring setup.

The system is built around one central body and interchangeable dials, allowing the user to adapt it to different cartridge families and measurement tasks. In use, the Datum Dial is designed to provide a relative measurement rather than a chamber print or absolute headspace specification, which makes it especially useful for comparing fired and resized brass during die setup. That approach suits careful case preparation, repeatable shoulder bump checks, and ongoing process control across batches of brass. The series is therefore a natural fit for reloaders focused on accuracy, brass life, and consistent ammunition assembly.

About the Forster Datum Dial body Assembly

The Forster Datum Dial body Assembly is the core component of the Datum Dial measuring system, intended for reloaders who already understand the value of tracking shoulder position during case sizing. Its role is simple but important: it provides the body that interfaces with the appropriate dial and a caliper so the reloader can compare cases before and after sizing. In practice, that means a clearer view of how much the shoulder has moved, which helps avoid guesswork when adjusting sizing dies.

For case preparation, this matters because consistent shoulder setback affects chamber fit, bolt closure feel, and brass working over repeated reloadings. A tool like this is especially useful when setting up a full-length sizing die for a specific rifle, checking whether brass from different firings is being resized uniformly, or confirming that a die adjustment actually produced the intended change. Because the Datum Dial system is based on interchangeable dials, the body assembly also serves as a flexible foundation rather than a single-cartridge tool. That makes it well suited to reloaders who work with several chamberings and want one repeatable measurement method on the bench. As a USA-made Forster accessory for case preparation, it fits naturally into a precision-focused reloading workflow where measurement is used to guide setup rather than estimate it.

About Forster

Forster Products dates its history to 1935 and focuses on tools for precision reloading and gunsmithing. Based in Lanark, Illinois, the company states that its products are made in the United States. Forster is widely associated with bench equipment and measuring tools used by reloaders who want tighter control over ammunition dimensions and assembly consistency.

Its product range includes reloading dies, case trimmers, headspace gauges, and sight-mounting fixtures, showing a long emphasis on tools that support careful setup and repeatable results. Among its better-known products is the Co-Ax Press, while its Bench Rest seating dies are also recognized for their alignment-focused design. That background makes Forster a natural name in measuring accessories such as the Datum Dial system.

Main Features

• Manufacturer: Forster
• Made in: USA
• Accessories for: Case preparation

Warranty

2 years. The Forster Datum Dial body Assembly is covered by a two-year warranty against defects in materials and workmanship.

In the Box

• Datum Dial body with case dial already mounted
• Storage box