Scope quality can be measured by how good it tracks. One way to find out is to do a box test. Here's the result of the IOR's box test at 110 yards. I'm using the 155 grain Lapua Scenar for my 308 for this box test. I initially fired three shot group on another target to see if my rifle zero is still on. I'm using a new batch of ammo, that I reloaded, using Winchester brass. I normally use Federal brass but I want to find out if Winchester will work with my rifle since I must have a truckload of them. The Winchester shoot half an inch low when compared with Federal but group just as well, so I left it alone. Fired the first shot at the center of the target and noted that the bullet impacted just as predicted, half inch low. I then dialed the elevation knob 3MOA up and windage 3MOA right and fired shot no.2. I then turned the elevation turret 6MOA down for shot no.3. For my 4th shot I totally got confused and dialed a total of 9MOA instead of 6. As you can see, shot no.4 ended up at the edge at the target. I went ahead and dialed the elevation turret 6MOA up, carefull this time not to make mistake, and fired shot no. 5. On shot no.6, I just reset both my elevation and windage dial back to my original zero and fired. And here the result!!!