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Wind or changes in air density?

This may be just a scholarly post, but I am interested in learning more about wind drift and BC's. After digging up my physics note I pose the question, after an explanation.
As an object travels in a direction it wants to keep going that way (newtons 1st law) Now when you spin an object it wants to stay orientated 90 degrees to the spin (right hand rule, point your thumb and turn your fingers) So we are left with two things kind of merged together to change trajectories. Density of the Medium (air) and movement of the medium (wind). Lets call density, drag. The drag felt by the projectile would be directly related to the shape of the object from the front, and efects pushing laterly we would say are due to the cross sectional area from the side. As we make projectiles longer and skinnier this gets lower. Since the drag is going to be stronger (bullet is moving at ~3000 ft/sec as opposed to wind ~10mph) Is the effective drift more strongly related to changes in the density of the air as the bullet travels over a distance?
 

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