Haven't watched it yet, but just by reading the comments I'm assuming the second shooter conspiracy from audio forensics wasn't taking into account bullets breaking sound barriers for additional pops. Bullets breaking sound barrier
Here's another tid bit of info.
"I'm no expert, but I believe the OP is referring to the sound of a bullet whizzing past your head
and the 'Sonic Boom' that can sometimes be heard when the bullet breaks the speed of sound.
And NOT the sound of the cartridge ignition/explosion
IN THEORY It depends on the speed of the projectile and your distance from the weapon,
So there are at least 2 elements to the sound.
1. The ignition of the charge (Muzzle Blast)
2. The sound of the projectile breaking the sound barrier (Bullet Bow Wave)
Apparantley this sound can be heard up to 100 m Gunshot Location Detection System - Wikipedia, the free encyclopedia
So then, If you are within 100m of the weapon (BUT NOT BEING FIRED AT)
you will hear 2 sounds (at least)
eg. The muzzle blast and the crack of the bullet breaking the sound barrier
If you are more than 100m of the weapon (BUT NOT BEING FIRED AT)
you may only hear 1 sound -
eg. The muzzle blast
If you ARE being fired at then you should hear 2 sounds as example 1
eg The muzzle blast and the crack of the bullet bow wave
or if you are a long distance away from the weapon then by the time
the bullet reaches you it may no longer travelling at the speed of sound
and therefore all you will hear is a whizzing sound as the bullet passes by
followed by the muzzle blast.
As mentioned before, So it all depends on your position in relation to
the weapon and the bullet.
If the bullet is travelling towards you then you should always hear the bullet first
(either crack or whizz) followed by the muzzle blast."