“Veterinarian here. Felt this hard growth during a routine examination of a rescue cat, knew right away it was some kind of foreign body and took radiographs — composed of some kind of metal. Removed it but not sure what it is? The bone shows no evidence of damage from impact.”
This is a .22 caliber round. Given the amount of deformation and lack of damage to the bones, it almost certainly went through something else before ending up where it did.