When used in conjunction with the Datum Dial (DD1010) the tool measures the relative distance of a bullet or cartridge to a point on the bullet's ogive. For 17, 204, 257, 277, and 338 bullets.

May be used:

• Before seating operations to check factory bullet/cartridge consistency.
• After seating operations to check the setup and consistency of your reloading process.
• Case and bullet/cartridge dials are interchangeable and provide quick measurement of different calibers.