Here is my ZKK 601 in .308 Win., modified by myself. Barrel shortened to 21", foreend trimmed down, Buffalo horn tip installed, butt pad changed.

It has one of those special Zeiss Jena 4x32 scopes in the special Brno mount.
I can only agree with Tilleyman: Sighting in these contraptions is a real pita!
The rear turret on the scope is for focusing, the front for elevation adjustment. The elevation adjustment is without clicks and tiny movements of the disc achive big jumps up and down. This is the easy part. Windage adjustment is really hard to do: There are four, two on each side, screws with very fine, read easily stripped threads. These press down the scope's dovetail into it's dovetailed bed on the mount. to achieve windage adjustment, you have to loosen the two screws on one side and tighten those on the other side, being careful to torque them evenly. When starting new it's a much better idea to use a more modern scope with both windage and elevation adjustment and Warne qd rings like I did on my ZKK 602 in .416 Rigby.