The amount of time you save just in setting up is worth buying one😆
Just getting the hang of all the other features now.
And so far, I have not had a WTF! moment with it.
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They can be used reasonably successfully if you have a known load that has been over something better like ced/ohler/magneto and preferably validated at long range.
Then on the day shoot a few of the known load over it and note the plus or minus speed then apply that to your test rounds.
Change of light like passing clouds shadows etc stuff them up (the F1)