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)
"Hunting and fishing" fucking over licenced firearms owners since ages ago.
308Win One chambering to rule them all.
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