[hadaclueonce]

I’m pretty sure many of the police officers know whether it was a 22LR

I disagree. Most I have seen have to look at the rear of a shell case to know the caliber.

[MilesVeritatis]

“I disagree. Most I have seen have to look at the rear of a shell case to know the caliber. “

I did not write that the police can know the precise caliber simply by listening to it.

I did indeed write that many can differentiate .22LR from a high powered centerfire cartridge like .223 or larger. .22LR sounds nothing like those more powerful cartridges. If you are around them enough, you certainly can hear the difference.