well, if your vortex was perfectly zeroed exactly halfway in its adjustment range, you should have around 57 MOA of vertical adjustment (which means once zeroed at 100 yards, you have 57 MOA to adjust for longer shots). I would give or take a few moa and make your adjustment range something like 50-60 MOA, only way to truly find out how much adjustment you have is to mount the scope on the rail, zero it, then run it all the way through to see exactly how much you have.