You don't really need the chrony now John. You've done it the better way.
Chrony can be good for helping with load development but you've gone about the validation the right way. Best guess of velocity to get you started and data entered into the app, then record actual drop data at various ranges out to beyond your normal hunting distances.
Then just set your app up so that it gives you the solutions to match what you had to dial in practice and you are done.
You cannot do it any better than that.
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