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The whole bullet gun fingerprint thing is total bullshit, but it’s not completely impossible to determine caliber depending on the size of the fragment which could rule out a specific firearm.
Edit: I dont fucking trust the forensic analyst either and the article stated there were few specifics. I agree with you but just wanted to point out that it is feasible to rule out some things
Gun "finerprinting" is and isn't bullshit.
The reality is that for a given configuration of a gun, you do get some rather distinct markings on a bullet. It is less "We can 100% determine this bullet was fired by this bigoted dipshit's gun so let's hand it to him so he can dramatically show he took the firing pin out" but you can get within a pretty high level of confidence.
Unless... the shooter cleaned their gun. Even just field stripping can often be enough. Let alone if they actually remove the firing pin and reinstall it (not even replacing).
So it is not useful if someone escaped for days and nobody could find them until they got narced on. It IS useful if you catch them on their way home and they don't know to do this.
But also? it depends on the bullet being intact. Which, as mentioned above, is not often the case for stuff like 5.56 in soft tissue.