Thanks for using Gun Log.
I just submitted an update to the App Store.
The update includes a new report for rounds fired. Also it contains new fields in weapon configuration and ammo. In weapon config you can specify sight height, twist rate, and the distance at which the rifle was zeroed. In ammo you can specify muzzle velocity and ballistic coefficient.
Also it fixes the problem where hand load info for bullet maker doesn't save, and makes the data pickers, keyboards, and keypads behave better when you don't dismiss them.
It can take a while for an app to be reviewed, but it should be there in about 10 days or so.