[Kadric]

It would be very consistent with a doctor who has been treating these wounds and that has seen some of the recovered bullets.
5.45x39: AK74: 60 grain: Bullet relatively remains in one piece and tumbles very quickly 2-3". Has a steel core.
5.56x45: M-16: 62 grain: Bullet tumbles after 6-8", has tendency to break/fragment at the cannular.

[Kadric]

The AK-47: 7.62x39: .311: normally uses a 123grain bullet it is also quite common for them to be steel jacketed.
The M-60: 7.62x51: .308: normally uses a 147grain bullet it has a copper based jacket.