There are "frangible" bullets in mostly handgun calibers-some are 224 caliber bullets that you must handload. You get a thin brass shell over a hollow point bullet traveling upwards of 3600+ FPS and when it hits something, it comes apart. Much like what you see on that deer. A bullet with enough power to create that wound would have broken the shoulder so almost as a certainty it was one of the frangible bullets. Because the deer is still walking around I would wager someone shot the deer with a pistol. A frangible rifle load would have broken the shoulder.