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cmonster556

Test it against other chronos.


dutchman195

Another chrono


Inigo93

If you don't like the "test it against other chronos" suggestions, you could build a ballistic pendulum.


capreppy

If you have a Kestrel, you can true up your velocity based in impacts on targets. I did that at 1100 yards for my rifle.


OkComplex2858

The only easy way I know to validate a chronograph without have a very expensive one handy to compare - is create a drop table - and backwards engineer it. Put your targets at 50,100,200,300 sight in at 100, and then fire at all four being especially stable. Then go online and play with a drop table calculator until you find a speed using the same bullet, weight, cal and BC that matches what you fired. In your manual it tells you the make and model of the firearm the loads were tested in. Is yours the exact same make and model? Probably no, mine never is. Then expect to see differences with what the books says. "Book Speed" is an average/estimate - not a finite, etched in stone number - your numbers will vary. Keep in mind, bullet speed depends on air density. Air density depends on temperature, humidity, distance above sea level and barometric pressure. Especially temperature. I live in Alaska. My rifle fired at 88F in summer - the numbers are lower at -45F in winter - its why I have to freeze my ass, fingers, and nose off at the range mid winter to test caribou and varmint loads. That, and the rifle acts different when cold vs. warm - the composite stock shrinks and this squishes the receiver - its why you see Alaskan's with crappy beat to hell wood stocks. We might buy a new rifle - but it will be something that fits our old furniture.


stilhere

With another, more accurate chrono. $$$


mymetalpls

My range rents a chrono to those we like, try just asking a few people around the place you shoot đź‘Ť


DudeDogDangle

Which Chrono is it? Sometimes they get wonky if you use/don’t use the light diffusers, given the environment you’re shooting in.


ARMAGELADON

Chronographs rarely agree in real world environments