In 1976 took EE360 Acoustics from professor Rubens Sigelman, at that time a pioneer in ultrasound.
I have worked for a couple ultrasound companies.
In 1996 I was into Remington CB Longs.
I asked on the early internet, "Why is the CB Long so quiet in a 24" barrel and so loud in a 22" barrel?"
The late gunsmith Randy Ketchum said to me, "The difference is the pressure threshold of supersonic gas escapement from behind the bullet."
I knew he was right.
I now know that a CB short can make more velocity with the same noise as a CB Long, because of the increased peak pressure and expansion ratio.
But the CB short has a longer jump to the lands and was getting poor accuracy.
Then ~ 2 years ago CCI started making 22 CB shorts that are accurate. The packaging looks the same.
With coons I like to go for the brain shot with CB shorts and 24" barrels.
But if they are way up in a tall tree, it takes 5 good body hits to bring them down.
My brother kills skunks and coons with CB shorts from a revolver. It has some super sonic gas, but he says he does not need ear plugs.