No! Not that kind! I mean in the external ballistics sense. I am thinking of using an app for my iPhone or just simply making some flash cards if I can only find a good external ballistics calculator. The problem is that all the ones I've found give MOA, but not mils. I plan to get a SWFA Super Sniper scope with Mil-Dot reticle and .1mil knobs, not MOA knobs. (Maybe here is where I can briefly rant about how foolish they were to put MOA knobs on several of their Mil-Dot scopes without offering those models with the mil adjustment knobs as an option...What's the use of having two different units of measurement on the same scope?! I hereby claim patent pending to an MOA-Dot Reticle. j/k) Anyway, any advise on a free or best bang for the buck external ballistics calculator is appreciated.