Many values for initspeed and airfriction were changed to unrealistic and nonsensical values.
Just two examples:
initSpeed changed to 860 from 820, airfriction changed to -0.00018 from -0.001006. The new initspeed/typicalspeed is okay (nominal muzzle velocity in 22" test barrel is approximately 853 m/s), but the new airFriction is ridiculous. The standard 143-149 grain FMJ bullets have a G7 ballistic coefficient of approximately 0.200. At initSpeed of about 853 m/s this requires an airFriction of approximately -0.001. The old value was correct. The new value of -0.00018 results in a G7 BC of approximately 1.00, that is five times higher than realistic.
What .308 Winchester (7.62 NATO) should look like, approximately:
initSpeed = 853 (for standard 22" test barrel)
airFriction = -0.00101
initSpeed changed to 960 m/s from 884, airFriction changed to -0.00024 from -0.00129. The old value of 884 m/s was correct for the M4A1 using M855 ammunition, however it became outdated when various other 5.56 weapons were added. The new initSpeed/typicalSpeed could be correct for certain weapons and ammo but is on the high side. For example, it's appropriate for the US Army's high-pressure M855A1 from a standard 20" barrel, but there are multiple countries or sources of weapons represented in the game and the M855A1 was not adopted until late 2017 anyways, so regular green tip M855/SS109 is a better choice. SS109 should have initSpeed/typicalSpeed of 940 m/s. That's a very typical velocity from a standard 20" barrel. The new airFriction -0.00024 is ridiculous. It's about 5 times too low! The 62 grain SS109-type projectiles have a G7 balllistic coefficient of approximately 0.155-0.160. To represent this in DayZ, you need an airFriction of at least -0.0012.
What 5.56x45 should look like, approximately:
initSpeed = 940 (for standard 20" test barrel)
airFriction = -0.00124
I only gave examples of two projectile types that have the wrong values applied, but right now, not even a single projectile has an appropriate airFriction.