When merged this pull request will:

• update the 9,3x64 mm according with the only one military application of this cartridge : the Russian sniper rifle SVDK, discontinued and changed for .338LM sniper rifles (kalashnikov.media 2018).
• update the Advanced Ballistics entries with these values: kalashnikov.ru PDF
• update the airFriction according with the SVDK muzzle velocity and the BC at the normal conditions (gap with AB 0.1 mRad (1 click) to 1300 m, 0.2 to 1400 m, 0.5 to 1500 m) : Range Cards.
• update the AtragMx GunList and adjust the bullet diameter to match as close as possible with the STRELOK PRO spin drift. The map latitude must be taken into account now with the AtragMx (match perfectly with Altis latitude 40° or Tanoa latitude -18° at 1500 meters).

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Ammo Class: B_93x64_Ball
drag model: 1
ballistic coefficient: 0.515
MaxRanges (m): [1000, 1000]
MuzzleVelocities (m/s): [775, 785]
Max. Velocity diff (m/s): 7.9
Max. Drop diff (cm): 6.28
Max. Tof diff (ms): 13.0
Optimal airFriction: 0.00080801

About the terminal ballistic, if i'm not mistaken (online translation) :

• 80% at 200 m with a 10 mm armor plat.
• 50% at 500 m with a body armor.

The vanilla B_93x64_Ball seems a little bit over powered, maybe it's better like that in-game ?

Thanks to Elgin675 for the exact designation of this cartridge used with the SVDK.
All kudos to Ruthberg for the AB and his tool.