Da Grizz and Nate,
The SA scope line has the reticle in the 1st focal plane, so mildots spacing from center to center will remain 3.6" (3.44 MOA) at any power setting.
You might have a look at the Exbal ballistic program. It has a ballistic reticle analysis section, and once you enter your load, reticles vertical tic spacing (mildots, Custom BDC, NP-R2, etc) and "point blank target height" (+ or -2", 3", 4", etc, from POA, it will tell you the near and far zero range for each tic on the scope, and its actual zero range. Very cool program.
The new PALM version of Exbal now has a range estimation calculator for use with the R2 or Mildot (right on!), and it's own maximum point blank range calculator too. The MPBR calculator tells you how high or low the shot will be if using a specific tic mark for the range you enter, works slightly different than the desktop Exbal program, it is very usefull.
You should get the new updated Exbal programs too, well worth the $13 to update. You'll love the new layout, links and features. I had mine two days after ordering it over the web, and thanks to John M. for pointing out they were available!!! Gerald's site didn't show the new screen views for the programs, just the older version. http://www.perry-systems.com
The new PDA software is a real nice improvement, also includes an actual drop chart link on the firing solution window... way cool.