Bit of confusion with twisting turrets
I have some confusion
I understand MOA, turning turrets left and right, etc
What i don't get it is, if the drop chart says 17, but the turrets only have 10 full marks on it.
Do i turn a full turn then up to 7?
What if i've already zeroed my scope and its on 3, then what do i do?
Bit of maths involved or?
If any information, will be appreciated