shoot the deer behind the shoulder thru the lungs, NEVER IN THE NECK OR ASS OR ANYTHING OTHER THAN THE CHEST CAVITY That goes for ALL calibers,
Yep, we all know that. And we all hunt in the real world, too. A deer often doesn't just stand there, perfectly still, perfectly broadside, with a perfect neon bullseye floating right between it's ribs, waiting for you to shoot right there, perfectly on the spot. Newsflash: sometimes the deer will be angled a little bit away or towards you, or facing you, or it'll have a big rib or shoulder bone that you just happen to hit, or it'll move right at the instant that you shoot, or you'll hiccup/cough right when you pull the trigger, or a gust of wind will suddenly blow when you take the shot and move your muzzle/treestand, or your trigger finger will be numb from the -20 degree temp that day, or, or, or, or...a million reasons that you might not take a perfect (or even excellent shot) at a deer. And when that happens, it is nice to shoot a caliber that propels a heavier bullet almost as fast as the .223. Like a .243, or a .270, or a .308 Winchester (which is what the really smart hunters use
), or even a .30-'06. So that you can smash through bone, penetrate through a thick part, put a hurtin' on the non-vitals, almost every time.
Why does this question keep coming up? If you want an increased chance of wounding a deer, then use the .223. Have fun tracking it for miles, and good luck finding it.