Triple ought is for the movies and deer hunters. Ought or #4 buck if you're serious about this.
I wasn't hunting deer in Vietnam. Don't think they even have deer. I damn sure I wasn't in any movie.
There were indeed deer critters in Nam. They were tasty too. Sika deer as I recall.
The one we whacked and brought home to the messhall was not small. Ballpark 200#.