The Medical Examiner may measure the wound, but that is not a determinant of caliber of the weapon used to make it. Skin stretches, and rebounds, swells, and suffers from abrasion form the bullet. The angle of impact, whether the bullet has passed through or been deflected by another object, all affect the characteristics of the wound, among other factors. That is not a determinant of who fired what at whom.
“Small and medium just don’t fit the many rifles and handguns I have used over the years. Sorry, but without specific calibers and bullet weights there can be no determination. “
Small and medium and Large are descriptions of bullets used by ME’s in autopsy reports.
Small is .22 or similar.
Medium is .38 or similar
Large is .45 or similar.
Bullets are passed to Forensics for exact determinations.
This has all been posted and discussed before.