I have little dilemma here.
We often read reports of people successfully taking game with what to my mind are "marginal" calibre's for the application. A good marksman, with the right conditions and right bullet and load, along with the animal presenting well can achieve miracles.
I wonder how many times animals have been wounded, escaped to die later as a result of using marginal calibre's. Or having to take numerous shots to despatch the animal. I doubt if we would ever find that out as folks won't be screaming to post on poor shooting and or losing game to poor shot.
The problem is that that the less skilled with a marginal calibre, marginal skill, poorer bullet may well be less fortunate.
So we mainly report success and forget the failures, a natural human trait for most.
Now while I take no issue with those who wish to shoot the lighter calibre's and who do so successfully I personally like slightly heavier calibre's. As Robert Ruark said "Use enough gun", not too much or too little.
Anyway to the OP, that is a great buck, well done on the shot. Where were the entrance and exit (if there was) holes located.