What is the Lyman "DA" die?

[FamDoc2892]

Picked up a set of Lyman dies in 7mm Rem Mag on a trade, three dies in the set are listed as Neck, FL and DA. Because of the thumbscrew top, I'm guessing the "DA" die is the bullet seater. Can one of you with Lyman experience confirm?

 

[drtybykr]

DA= Double Adjustable. You can adjust both the crimp and the bullet seating depth.

This is your seating die.

 

[FamDoc2892]

Thanks! Makes a lot more sense now!