Blowing on Bullets:
If only the wind pushing on a projectile explained its deflection to the side, same-weight, same area, higher BC bullets would have no less wind deflection for a given time of flight (TOF) than blunt shapes do, but they do have less deflection. When it comes to which otherwise-identical bullet will be least deflected by wind during a given TOF, it is always the one with the highest ballistic coefficient. That is because it has lower drag turned into the wind vector. It is the wind vector, in effect, steering the direction of drag that causes wind deflection. There is not enough direct force from a side wind to produce the amount of wind deflection that actually occurs.
An Example:
A CCI 22 LR Standard Velocity round is fired from a rifle at the factory-claimed 1070 fps. Its flat fire TOF to 100 yards in an ICAO standard atmosphere is 0.3024 seconds. If it is fired in a 10-mph crosswind, it will deflect 3.877 inches at the target. If we calculate how far the wind could blow that bullet in that circumstance, we get a much smaller number. About 0.068 inches. Even if we pretend the bullet doesn’t yaw to point into the wind and instead pretend the wind moves with the bullet and blows on the side of it, in 0.3024 seconds, it works out that a 10 mph wind will blow the bullet, not quite 0.55 inches. So there is no way to account for the observed amount of deflection by having the wind blow on the bullet.
I have attached a file with the calculations for anyone interested in them.
Estimating TOF from Bullet Drop:
In the air, everything has a terminal velocity. Assuming point-forward bullets, those with higher ballistic coefficients will have higher terminal velocities. This means that when fired at the same velocity as otherwise-identical bullets with lower BCs, their total drop will be greater. If I fire the old Hornady .308" 150-grain RN at 2800 fps, after 1 second, it has traveled 525 yards and has a total drop of 141.5 inches. If I fire the Hornady .308" 150-grain FMJ BT at the same velocity, after 1 second, it has traveled 674 yards and has a total drop is 157.4 inches. A bullet dropped in a vacuum, using the 32.17405 ft/s² gravitational constants, will fall 193.04 inches in 1 second so that you can see almost a quarter of the gravity drop is being shaved off by drag.
Estimating TOF from bullet drop is most easily done using a point mass solver. If you know your muzzle velocity and zero, plug those in, then tweak the BC until you see the same drop on paper that you actually measured. At that point, the program’s TOF should be a good match.