No zero stop. I have that on my Nightforce NXS 8-32x56, so I'm familiar with that set up. In the S&B manual, it has you bore sight the rifle/scope, then zero the turrets, then shoot and make the adjustments, followed by zeroing the turrets again.
The only reason I ask was because I'm up into the 3rd turn of my multi-turn turret. The turret has a window on the top to indicate which set of rotations you are in from zero to make adjustments and return to zero quicker. My Nightforce just has hash marks on the turret to indicate travel from zero, but you don't have an exact number of turns unless you're counting them.