valentin.d writes:
Experts can easily identify species of firearms, even in the absence of a bullet.
As far as I know, forensic experts can only estimate the caliber of a bullet that caused a wound yesterday. A hole in an ancient fossilized skull would be eroded, etc. so that even an estimate would probably not be possible. As for identifying "species" of firearm, you need
something like a bullet or a cartridge casing. A hole just doen't give enough information.