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

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

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

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

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.

NOTE: According to the specifications on Swarovskioptik.com Z3 Riflescopes are NOT true MOA, 1.047"/100yds they are actually IPHY aka SMOA, 1"/100yd