I agree with Ron, it's not the size that matters (no matter what some others might tell you)
but it is all about how sharp, how long head stay sharp thru the animal, and where the shot is placed!
DD brings up an interesting point on minor wounds. After a summer eating a lot of green leafy vegetation, deer's bodies are packed with Vit K which aids in clotting & healing. Seems Momma Nature provides for that to withstand the wounds of the rut and fights!
My only problem with the "tracking" comment is you won't do that where I hunt. Our areas are such a "checker board" of access, deer will run over NO TRESPASSING marked boundaries in any direction in 100, 200, 300 yards if a marginal hit. You'd better hit em right and put em down quick. Still need to track em into thickets and such, and 2 holes leave better leaky trails!