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How high above the sensors you will have to send the rounds depends on the available light.
Bright cloud cover, that diffuses the sun light, is best for getting good readings without putting the chronograph in danger.
Be extra careful when using scopes or high mounted sights, though.
As for being useful, they are indispensable for safer and accurate reloading, and also for knowing velocities, for figuring ammo ballistics.
Sure beats guessing.
__________________
Walt Kelly, alias Pogo, sez:
“Don't take life so serious, son, it ain't nohow permanent.”
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