I'd say the bullet performed just right in that medium........ even hitting a bone, I doubt the bullet would fragment to that extent. Deer bullets should expand in the soft tissue of a deer.......that's how they do their damage.......and why most states outlaw non expanding ammo........
Many years ago, I had a friend who used military ball type ammo......the deer he shot took 11 rounds before going down, 2 directly through the heart.
Again, Remington corelots have probably killed more deer than any other bullet made.........with your winchester silver tips scoring millions of deer as well........Don't worry about it, they'll get-r-done.......