There should be up/down indicators on your turret adjustments. The arrow refers to the direction you want your point of impact on the target to move.
These are nominally either 1/4 or 1/2 inch per click at 100 yards.
Nominally. Sometimes they are even right - but only actually shooting groups will tell. On "new" stuff, I use 3 shot groups, the center of these 3 holes is what I assume to be my real POI.
Last edited by las; 10/15/14.