I'm not sure if the ballistic of the game is part of it's engine but in any case sorry in advance.
I wanted to report this since a long time I just did not know how to do it, but as far as no one spoke/noticed about this, I'm looking forward to reporting it.
I don't know if anyone noticed it, but bullets ballistic aren't being dropped because of their low-speed, but simply because there is some time applied to each projectiles and they can't fly anymore when that time expired.
How I noticed it:
I was checking out the FFIS mod (fire and fight improvement system), that I mainly downloaded because of its AI suppression improvements and mostly because the wind simulation is supported for most types of projectiles.
Once again, I was using a bullet-cam tool to check the bullets trajectories and adjusting the winds force.
So, actually without the presence of wind, the projectile will be dropped within the 6 seconds.
Do that test again but with winds force maxed out, all you have to do is use any weapon and fire in the wind direction... the projectile will not be slowed down and instead, will rather be accelerated by the influence of wind. Sometime it will even fly faster than its innit speed... However, even if its speed increased because of the winds force, the bullet will still fall down within the 6 seconds delay.