I use strelok. I like it because you can have it on your iPhone and your iPod and upload/download the file using dropbox. So, you can sit in front of the fire and work on the big iPad screen for loading all your data, export it to dropbox, then download the file to your iPhone for field use. You can also email yourself the ballistic tables and import them into excel for making up your drop charts to affix to your rifle. It also has a huge database of reticles which it will calibrate for you based on your load, scope FFP or SFP, and magnification.
Here's one of mine that I made up for the .17HMR
and the .22WMR
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