The Sig / ABS app is updated with the most current Litz bullets and data as of about ten days ago and yes you'll need to have the unit to make it all work.I have one on order and was looking through the app and I could not acess the bullet library. It says I need to be connected to the device. Must have the info stored in the unit. Are the bullets in the library the "litz" version as they are in the AB mobile app?
The original AB Mobile app currently available does not have the most recent library. However, I'm beta testing the new version of that app as of a few days ago and the beta version has all the current bullet data in it.