You're right with the rhino,the shot is too low and way forward, seems to hit in the fold of skin under the jaw, not the neck that's higher.
The first shot on the ele is almost spot on, the second no clue at all, the third too low.
The buf is hit right in the middle of the chest backward of the right front leg. Hit the lungs, but over the heart, could hit the aorta and other large vessels.

According to the size of the barrel, this rifle calibre seems bigger than a 375?