Yes it would be confusing if you don't know what I am trying to describe. Weaver's smart zero allows you to zero your rifle then screw down the internal adjustment knob leaving the center of the reticle where it is there by giving the user the entire amount of vertical adjustment that comes with a 34 mm tube up from their zero'd position. So just for explanation lets say that you have 65 mils of total vertical adjustment in a 34mm tube. Most scopes on a 20 moa base, after jumping the zero, allow you to use 2/3s of that adjustment. By being able to bottom out the adjustment screw while holding the reticles on the zero you have for your rifle, you then get the entire
65mils of adjustment up from your zero. You can and would be suggested that you bottom out a few .1 mil below zero by turning the turret down a few clicks then loosening the set screws and spinning down the adjustment screw to bottom, tightening the set screws.. When you now line up your zero hashmarks you actually have a few clicks below zero before you get to your hard bottom stop.

That probably confused you even more. Just suffice it to say that they have it set up so you get to keep all of your adjustment or most of it really.