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.

Dial	Calibers
Bullet/Cartridge Dial #1 (DD1111)	224 Cal (5.56mm) 243 Cal (6mm) 264 Cal (6.5mm) 284 Cal (7mm) 308 Cal (7.62mm)
Bullet/Cartridge Dial #2 (DD2222)	172 Cal 204 Cal 257 Cal 277 Cal 338 Cal
Blank Dial (DD7777)	— (Five pilot holes in aluminum disc)

May be used:

• Before sizing operations to find the optimal headspace for your firearm
• After sizing 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.