
Availability: In Stock
The Forster Products Datum Dial Body Only is the core measurement tool serious handloaders use to dial in precise case setup and verify sizing consistency across multiple calibers. Unlike traditional calipers that require manual math, this system measures directly from the case base to a specific datum point on the shoulder, giving you exact, repeatable numbers for headspace optimization—before sizing, after sizing, or anywhere in between.
What sets the Datum Dial apart is its simplicity and versatility. The body accepts interchangeable dials for case and bullet/cartridge measurements, so one tool covers 17, 204, 224, 243, 257, 264, 277, 284, 308, and 338 caliber work. No need to buy separate kits for each caliber or deal with complex component stacks; four total pieces give you the measurement accuracy that competing systems require far more complexity to achieve. Whether you're fine-tuning your sizing die setup or confirming run-to-run consistency in production reloading, the Datum Dial eliminates guesswork and gives you the data to make informed adjustments.
This is the body-only version, designed for reloaders who already own the interchangeable dials or want to purchase them separately. You'll need a caliper to use it—the Datum Dial body attaches to standard digital or mechanical calipers to convert their sliding jaw movement into direct datum measurements. Comes with a laminated reference chart of common datum diameters and a durable plastic storage box to keep everything organized on the bench.
| Product | Datum Dial Body Only |
| Manufacturer | Forster Products |
| Supported Calibers | 17, 204, 224, 243, 257, 264, 277, 284, 308, 338 |
| Components Included | Body, laminated datum chart, storage box, instructions |
| Caliper Required | Yes (not included) |
Any standard digital or mechanical caliper will work with the Datum Dial body. The system attaches to your caliper's sliding jaw to measure datum points precisely.
The body accepts interchangeable case and bullet/cartridge dials. This product is the body only; dials are sold separately but one set of dials covers all supported calibers (17 through 338), so you don't need multiple kits like you would with some competing systems.
Yes. You can measure cases before sizing to establish your firearm's optimal headspace, then measure again after sizing to confirm your die setup is consistent and repeatable.
The body-only kit includes the Datum Dial body, a laminated reference chart showing common datum diameters for various calibers, instructions, and a plastic storage box. The interchangeable dials and caliper are purchased separately.

SKU: 194198614 • Weight: 0.85oz





Availability: In Stock
The Forster Products Datum Dial Body Only is the core measurement tool serious handloaders use to dial in precise case setup and verify sizing consistency across multiple calibers. Unlike traditional calipers that require manual math, this system measures directly from the case base to a specific datum point on the shoulder, giving you exact, repeatable numbers for headspace optimization—before sizing, after sizing, or anywhere in between.
What sets the Datum Dial apart is its simplicity and versatility. The body accepts interchangeable dials for case and bullet/cartridge measurements, so one tool covers 17, 204, 224, 243, 257, 264, 277, 284, 308, and 338 caliber work. No need to buy separate kits for each caliber or deal with complex component stacks; four total pieces give you the measurement accuracy that competing systems require far more complexity to achieve. Whether you're fine-tuning your sizing die setup or confirming run-to-run consistency in production reloading, the Datum Dial eliminates guesswork and gives you the data to make informed adjustments.
This is the body-only version, designed for reloaders who already own the interchangeable dials or want to purchase them separately. You'll need a caliper to use it—the Datum Dial body attaches to standard digital or mechanical calipers to convert their sliding jaw movement into direct datum measurements. Comes with a laminated reference chart of common datum diameters and a durable plastic storage box to keep everything organized on the bench.
| Product | Datum Dial Body Only |
| Manufacturer | Forster Products |
| Supported Calibers | 17, 204, 224, 243, 257, 264, 277, 284, 308, 338 |
| Components Included | Body, laminated datum chart, storage box, instructions |
| Caliper Required | Yes (not included) |
Any standard digital or mechanical caliper will work with the Datum Dial body. The system attaches to your caliper's sliding jaw to measure datum points precisely.
The body accepts interchangeable case and bullet/cartridge dials. This product is the body only; dials are sold separately but one set of dials covers all supported calibers (17 through 338), so you don't need multiple kits like you would with some competing systems.
Yes. You can measure cases before sizing to establish your firearm's optimal headspace, then measure again after sizing to confirm your die setup is consistent and repeatable.
The body-only kit includes the Datum Dial body, a laminated reference chart showing common datum diameters for various calibers, instructions, and a plastic storage box. The interchangeable dials and caliper are purchased separately.
SKU: 194198614 • Weight: 0.85oz
