In my (opinion), the problem is your choice of the word (precise).
Nothing will be precise, at least all the time, meaning every time you use it.
Varying conditions such as a change in altitude, or temperature, even leaving a round in a hot chamber for a few minit’s before firing it can cause your chart to be at least slightly off.
That said, the best way to find out the information you want is to shoot the gun at various targets and make your own chart based on your results.
Consider that as recent as the early 80s, there were no scopes like the many available today having the ability to dial.
Other than a very few target scopes like Unertle and a few others.
There were a few companies offering custom reticles usually designed around your specific cartridge and gun.
So if you moved the scope to a different gun was it now useless?
Not really, but it did/does take some effort by way of shooting to get the information.
I have a scope set up with a multi dot reticle with dots from 100 out to 1000 yds for a 7 Rem Mag.
I later moved the same scope to a wildcat 300 Weatherby necked down to 7mm with over 300 FPS more velocity than the 7 Rem using the same bullet.
Testing at various distances proved that i had gained a dot, meaning that what had been 500 was now a 600 yd dot.
Fact is that all charts should be confirmed for accuracy by actual shooting, and none will ever always be precise.
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