.25 MOA turret clicks are indicated on the turret with short lines around the base, .5 MOA markings are indicated with longer lines, 1 MOA markings are indicated with a longer line and the number of MOA above.

1 click = .25 MOA = 1/4" @ 100yds = 7.2mm @ 100m 

Each full rotation contains 46 clicks, equivalent to 11 .5 MOA.

With the factory zero stop installed, there are generally 41 clicks available, equivalent to 10.25 MOA

To achieve 2 revolutions of the turret the factory zero stop must be removed.  See How to Remove Factory Zero Stop.

It may also be necessary to use a tapered scope base on your action or scope rings that are fitted with offset inserts to get to 2 full revolutions of your turret.