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So... you definitely DO hear the "crack" sound of the bullet breaking the sound barrier when you are behind the gun, at least when shooting a 22 rimfire RIFLE. With a pistol or with louder cartridges, the sound of the muzzle blast is so much louder that it drowns out the less-loud sound of the bullet breaking the sound barrier, unless you are far enough away from the louder sound of the muzzle blast (like downrange).
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Not quite. While working up loads for my 10mm, many years ago, I discovered the supersonic loads were FAR louder than the subsonic. Differences of only 50 fps during transonic testing were substantially louder.