@ Peregrino
Yes, sir, that is how I think things happened.
@ Kachingkapow
You are right about the Tokarev. My sample insert that matches that radiographic contour is from a 7.62 x 25 Sellier and Bellot round that is steel jacketed and has a mild steel insert.
http://i55.photobucket.com/albums/g1...ob/Insert2.jpg
In the picture linked above, image (1) is my sample insert removed intact from a 7.62 x 25 S&B round. The insert is placed at an angle on a radiolucent sponge so that I can approximate its attitude according to how I think the insert is positioned in the victim's ankle.
Image (2) is the resultant radiograph of the sample at that angle.
Image (3) is a cropped rotated equalized view of the insert from the victim's radiograph, for direct comparison.
The radiograph of the sample is not a 100% perfect match because I have the sponge angle slightly off, but there is no doubt in my mind that the sample insert is a possible match to the insert that was never recovered.
The big question now, is whether any other ammunition uses that insert, or whether S&B made that insert out of a variety of materials.
Here is the Tokarev round (this is a second sample that I sectioned):
http://i55.photobucket.com/albums/g1...b/Tokarev7.jpg