Forster Datum Dial Ammunition Measurement System Complete Kit in Storage Box
$134.73
The Forster Datum Dial Ammunition Measurement System Complete Kit is a precision reloading tool designed for handloaders who want tight control over case headspace and sizing consistency. Unlike generic calipers, the Datum Dial measures cartridge cases at a specific shoulder datum point—the exact reference surface your firearm uses—giving you real data to dial in your sizing press and validate your work. Whether you're fine-tuning a new reloading setup or troubleshooting inconsistent ammunition, this system eliminates guesswork and helps you build safer, more accurate loads.
The kit comes with interchangeable dials that cover a wide range of common rifle calibers—.17, .204, .224, .243, .257, .264, .277, .284, .308, and .338—so you don't need to buy separate kits for each cartridge you reload. The modular design uses just four components to deliver that caliber coverage, keeping your bench clean and your workflow simple. Each measurement is direct and absolute; there's no arithmetic involved, no subtracting bushing lengths or making mental corrections.
Use it before sizing to establish the optimal headspace for your rifle, or after sizing to verify that your press setup is producing consistent results shot after shot. The included laminated chart shows common datum diameters across popular calibers, so you can quickly reference what you're aiming for. Everything packs into a durable plastic storage box, keeping your Datum Dial and dials protected and organized between sessions. Note: you'll need a caliper to take your measurements—the Datum Dial is the reference tool, not the measuring device itself.
Key Features
- Interchangeable case and bullet/cartridge dials cover 10 common rifle calibers
- Measures datum point on cartridge shoulder for accurate headspace reference
- Only four components required—no extra inserts or adapters to juggle
- Absolute measurement system eliminates arithmetic and setup complexity
- Laminated caliber reference chart included
- Durable plastic storage box keeps all components organized and protected
Specifications
| Manufacturer | Forster Products Inc |
| Product Type | Datum Dial measurement system |
| Caliber Coverage | .17, .204, .224, .243, .257, .264, .277, .284, .308, .338 |
| Components Included | One Datum Dial tool, case dial, bullet/cartridge dial, laminated chart, instructions, storage box |
| Storage | Plastic storage box |
| Caliper Required | Yes |
Frequently Asked Questions
What calibers does the Forster Datum Dial fit?
The complete kit includes dials for .17, .204, .224, .243, .257, .264, .277, .284, .308, and .338 caliber cartridges. The interchangeable dial design means you can swap them as needed without buying separate kits for each caliber.
Do I need a caliper to use this system?
Yes, a caliper is required. The Datum Dial is a reference tool that holds your cartridge and identifies the datum point on the shoulder; you use your caliper to measure the distance from the case base to that datum surface.
What's the difference between the case dial and the bullet/cartridge dial?
The case dial is used to check fired or sized cartridge cases before or after your sizing operations. The bullet/cartridge dial accommodates loaded rounds so you can validate your finished ammunition. Both are included in this complete kit.
Can I use the Datum Dial to set up a new reloading press?
Yes. Measure your fired cases with the Datum Dial before sizing to establish the optimal headspace for your specific firearm, then use those measurements to dial in your sizing press setup. After sizing, measure again to confirm consistency and that your press is working correctly.
