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About supersonic bullet speeds...I don't think they play a huge part in increased sound level.
The "crack" you hear from supersonic rounds is relatively subtle compared to the powder blast. Sonic "booms" are from objects creating sound as they break the sonic barrier; due to the speed, sound is multiplied as sound created over a longer period arrives at the ear at the same time. The original sonic boom was from aircraft, making a lot of noise.
But a bullet traveling through the air doesn't create nearly the sound volume of the powder blast (or a jet aircraft)...so while supersonic shots (from a distance) are unique and heard as a crack in addition to the boom of the powder blast, up close it is basically drowned out by the powder blast.
JMHO.
Blue1
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