The Forster Datum dial Ammunition Measurement System is an easy-to-use and versatile tool that provides the data you need to refine your case sizing and bullet seating operations. The core components are a body and three interchangeable dials that, when used in a repeatable manner with your caliper, are used to measure relative distances between selected points on cases, bullets and cartridges.
SPECS: Datum Dial comes with storage case. Kit includes: Case Dial, Bullet/Cartridge Dial #1, Bullet/Cartridge Dial #2, and Storage Box. Dial #1 for .224, .243, .264, .284, .308 bullet diameters. Dial #2 for .17, .204, .257, .338 Bullet diameters