You need to call the custom shop and talk to them. I am of the opinion you can have anything you want, if they do it at all, from the custom shop. They will make up a custom reticle for you, for instance.
The last I heard, you get either 50 yds, 200 yds or 400 yds. for a custom parallax setting for any Leupold scope. However, on the 6X42's I have, and that's two M8's and one FX3, I can reduce what parallax is there to almost nothing at either 100 yds. or 300 yds. That's due to the long depth of focus of the 6X42. I use the ocular for this. My groups go from 4.5-5 inches on one rifle to 2.5 inches by simply reducing the parallax with the ocular. That's at 300 yds. BTW.
I just remounted an FX 2, 4X on my .308. Had it in for still another reticle change. Good, easy folks to do bussiness with. Great for those of us that like to nit pick and tweak our rifles. E
