shots 1 to 6 and 9 are from a smaller calibre, 7 & 8 are a different calibre
About the only reliable information you can get from that audio is the timing and *maybe* the number of shots if you count them right eliminating echoes.
Camera and phone microphones are not scientific sound instruments. They will not reliably or precisely record impulse amplitudes.
Take a look at this and see how much the amplitude changes depending on the direction of the muzzle alone at the same distance for 8 microphones ... pages 6-8 have cool charts.
Just changing the direction of the muzzle changes the amplitude of the sound on quality metering equipment.
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