I would say you pretty much covered it with this post. Breaking both shoulders, not fragmenting into nothing, DRT, bullet found just under the hide, all this with a light for caliber bullet, looks like fine performance to me. I'd stick with it.
Took the words out of my mouth. Breaking both shoulders, no core separation at short range with a briskly moving bullet, plus all the rest. If he shot the same bullet again at the same buck with just a slightly different angle, whose to say it wouldn't have broke both shoulders and poked all the way through. Not that it matters after taking out both shoulders and ruining the tissue in between. And if the buck had quartered towards him, chances are it would have broke the fore shoulder, traversed the chest cavity and exited the opposite side aft the other shoulder. As TexasRick pointed out, one rung up the bullet weight ladder and this thread probably wouldn't exist.
