Re: Humidity effects on External Ballistics.
Relative humidity plays more of a role at higher temps.
105VLD ICAO G1 BC @ 3Kfps = ~.525
ICAO = 59degF, 0%RH
Change only to 90%RH local BC = ~.528
Now, change to 100degF, 0%RH local BC = ~.566
And 100deg, 90%RH local BC =~.579
A little more significant(.013)
At 1kyds drop changes from RH spread:
@.525, drop = 320.8
@.528, drop = 319.8
1" drop diff
(also 0.6" in 10mph drift)
@.566, drop = 307.5
@.579, drop = 303.8
3.7" drop diff
(also 2.1" in 10mph drift)
No predicting change to tune really.
Most consider these differences to be insignificant, as they have considered so with horizontal & vertical coriolis, gyroscopic drift, and magnus effect.
It's when you start adding all these together that single shot ACCURACY becomes more of an abstract.