I dialed in at 100 yards , figured might as get the most out of the cap.
That's not case. The dial only has so much moa adjustment. I could be wrong but by setting your dial start at 100 you'll lose some moa at max distance. Most of us will never shoot max distance of our scope so most likely no big deal.
Your dial will go the same number of mils or moa up regardless of where you set the "zero." If you set at 200, you can't dial below 200 whereas if you set zero at 100 you can obviously dial 100.
So, if you can dial out to 900 yards (complete random amount), it's always going to dial to 900. If you set "zero" at 100 you can dial 100-900, if you set to 200 you can dial 200-900.
You lose clicks on the lower end, not the upper end.
For the CDS dial, you don't actually set "zero", you set the minimum distance on the dial at the zero stop and dial up from there. The MOA or mil numbers are replaced by yardage, so there is no "0" on that dial.