looks to me like the wound is actually the entrance and exit. your bullet im sure is laying somewhere in the woods but upon impact it looks to me as the bullet struck and contacted the spine it turned bone fragments into little projectiles making a some what shotgun effect which would cause such a large wound.

Ive shot deer with 240 grain XTP/Mags over 110 grains pyrodex with the entrance wounds hitting square with a rib on one side and those rib pieces making additional exit wounds with pieces of bone stuck in the flesh around the wounds, several inches from the obvious bullet exit wound.

I seriously doubt your bonded shockwave acted as a ballistic tip as you seemed to think, if for some reason it did actually explode like a ballistic tip then you would have shards of copper and lead within and around the wound. just my 2 cents