I've got the 'Ballistic' app (Apple), which allows you to record all the info about your load - powder, bullet, charge weights, MV - and calculates a drop chart, on the info you've stored - for that specific data entry.
Works really good.
Haven't been able to find one for Android yet, that matches the flexibility of Ballistic.
Waiting patiently, so I can use the phone too, and interchange files as necessary to keep data up to date.
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