I am a big fan of the ballistics advanced edition of iOS, but today it got a huge update. You can now import reticles! I just imported the March MLR-1 and it looks excellent! Another great improvement to an already exceptional app!
you create a new optics profile, under reticle, select image, then use one from your photo library, which you should be able to download to your photos from the internet.
If you check in the app update, they give a pretty detailed note with an explanation of which types of images work best, and very specific instructions. They even list a couple of links to Leupold and NF reticle pages. They have really been cranking out the updates for the past couple months; but I believe this is a full version release...