One thing I've never heard was what sort of bullets were used. THAT has an immense bearing on what sort of wounds are created. A fully jacketed would make "neater" entrance and exit wounds than a soft-point. The entry angle would also make a difference in the entrance wound.

But there's a good discussion of all aspects of the case here. Be advised that there are pictures which some might find disturbing, and some ideas you hold will be challenged (some of mine were).