With scope adjustments, don't think so much in terms of the size of the average group size the rifle is capable of shooting, just think how much you want to move the group.
When zeroing, most shooters consider the rifle set when their group CENTERS on the target at the desired zero range. That's what you want to move when adjusting the scope. Consider that a .5MOA adjustment per "click" will be moving your Average Group Center .523" @100 yards, 1.047" at 200 yards. Add distance and that .5MOA adjustment will move the center of your group a massive 4" at 800 yards. May not sound like much but that's only with ONE click. Compare that to just over 1/2" when using a 1/8MOA per click adjustment.
If getting "ON TARGET" faster is your goal, then use the MOA reticle in your scope, (Or Mil-Dot if that's what you have)
I prefer the 1/8 MOA Turrets for my scopes. When zeroing I just hate trying to move the point of impact to the center of a target and find that one click puts me in the same place only on the other side of the target dot or "X".