I think you'll have trouble with an objective test because of lack of data. E.g. does anyone ever put up photos of deer they missed or had to track and finish? Not impugning the skill or honesty of regular posters there, just putting out a known unknown.
Once we had the miss/not-enough-gun-due to-bad-shot-placement data we'd then need the same data for another calibre that is a 'recognised' minimum, e.g. .243.
We can't get it, so my ignorant position is "in the hands of a proficient shooter with good shot placement, the .223 is fine, but not for occassional shooters."
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