Knowing your scope's mechanical center—the MOA center for up/down elevation and right/left windage—will save you time and effort when you have to recenter the reticle before zeroing.
After zeroing, this information allows you to know the remaining up/down clicks after adjustment and can indicate the need for a shim if there's not enough elevation to go to maximum range.
Know the Reticle
The reticle should be crisply focused, but you also need to know the exact MOA measurements in your reticle so you can use it for range estimation.
On a duplex reticle, the distance from the crosshair to the start of the thicker reticle portion is probably about 10-15 MOAs, which equals 10-15 inches at 100 yards, twice that at 200 yards, three times that at 300 yards, and so on. This is explained further in the range estimation section in Chapter 12.
Should your reticle have mil dots, you must master how to use them for range estimation, moving-target leads, elevation holds, and wind compensation.
Actually fire at each indicated distance on your Bullet Drop Compensator and record even slight differences. On another day, again fire at each of these 100-yard increments, applying the fine-tuned differences you noted earlier and see if you're now dead-on, as you should be. If not, refine again and test again.
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