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These separate Bullet/Cartridge dials are to be used with the Forster Datum Dial Ammunition Measurement System. These Bullet/Cartridge dials are used to measure the relative distance of a bullet or loaded cartridge from the base of the bullet/cartridge to the bullets ogive.
Dial #2 can be used with 17 Caliber, 20 Caliber, 25 Caliber, 270 Caliber, 6.8mm, and 338 Caliber Bullets.