Try to quick calculate the “minutes of angle,” or MOA adjustment, for your riflescope on an big bull elk 435 yards away. Go ahead, try it, with the ammo you plan to use this hunting season. Some of you will say “no problemo” and easily be able to calculate the correct click adjustment or holdover quickly and quietly in your head.
The rest of us are a little too excited about the elk to have a clear enough head to do that. And many of us have little if any ability to calculate these kinds of things in our head on the fly even on our best day with no elk in the picture.
This has led to the advent of what I call “Zero Math Riflescopes.” With a Zero Math Riflescope, the lines in the scope reticle have already been pre-calculated at given distances for the ballistics of the load you are using. We’ve already covered this somewhat on the Nikon .223 series, but those scopes are really for only one load of one caliber. The lines in the reticle, or the clicks on the turrett, match the distances if your velocity matches the standard value for that caliber, in this case 2340fps. for .223. But what if you have a shorter barrel than the test barrel on the ammo, or your handload doesn’t match the published numbers for factory ammo velocity?
The Zeiss Rapid-Z Reticle series, tested here on their Victory FL and Conquest riflescopes, calculates these numbers (click here to log in to the calculator) for any big game hunting caliber, and provides you with easy holdovers for distances from 100 to up to 1000 yards. The scope does this with no math whatsoever, and the online calculator explains how to make sure you scope is set correctly so that the 100 line hits at 100 yards, the 200 at 200, the 300 at 300, all the way up to 1000 at 1000 with the Rapid-Z 1000. Check out the pictures of the reticles here on the side. As you can see, they all have these what seem arbitrary lines, but they aren’t so arbitrary. The Rapid-Z calculator on the Zeiss Sport Optics website calculates the correct power setting on your riflescope to match these lines to actual distances downrange based on your ammo.