Wasted Step in Software:
The software changes the MV anyway, the only way they can true is either MV or BC, so the values are adjusted as needed and most just play with MV because they don't understand BC.
Really you can start with any number in software, like for a 6.5 with a 140, just put 2750 in the kestrel, and then once you go to true that number will change. It's 25fps per .1 mil adjustment.
You want a Chronograph for reloading, not software, it's a wasted step today. We are not attempting to predict in a vacuum we know we need to adjust it to match. The idea behind the MV was to predict when you can't shoot, we know that is flawed, so just wing it to start.
That said, I like the pairing between Magneto and Kestrel it makes sense, been talking about consolidation with companies a lot lately, this fits. It was a good idea.
If you reload, chronograph, if not, borrow one or let the software tell you based on drop.