# 1. Like many European scopes, the elevation dial turns clockwise for "up" and has click values in 0.1 mil.
During testing, I shot the 4-16x56 mm Hensoldt on the 7mm Remington Magnum Accuracy International rifle at a variety of 0.5 - 2 moa steel targets from 100 to 1350 yards. The scope simply worked with no drama. I did have a chance to shoot at an approximately three-foot diameter steel plate at 1850 yards; however, six mils of elevation taken up under the scope's zero, I ran out of elevation before I could get the bullets on-target. With the six mil zero offset, I was limited to dialing about 18 mils elevation. I needed a little bit more, so I just used reticle-based holdover in addition to dialing as much as I could with the knob.
# 2. The advantage of mil-based clicks (0.1 mil per click) is that the units of the knobs match the units of the mil-dot reticle.
The second evaluation - qualitative comparison of scope features - offers more differences. All four offer FFP reticles. The USO's "EREK" elevation knob has user-adjustable zero stop; it can be configured a variable amount away from the true zero. The S&B and Premier both have true zero stops. The Hensoldt 4-16x56 mm does not have a zero stop. All of the scopes have what I term a big, many-click knob, allowing the shooter to get to 1000 yards in less than one full turn. The S&B and Premier scopes have optics or physical flags that indicate when the elevation knob is on the second turn. The USO SN-3 and the Hensoldt rely on conventional hash marks on the turret body to indicate the knob revolution. In comparison, the Hensoldt lacks two qualitative features offered on other high-end scopes for practical long-range shooting.