Excellent point. Brother went hunting with 5.56 one year and grabbed the wrong mag. He grabbed FMJ. Through and through. He didn't get his deer and the poor deer had a very bad day.
That said, the HP loads he used had no trouble dropping white tail and mule.
A wounded animal getting away is the worst feeling.
I wouldn't use 5.56 on deer, I guess you could in a pinch but very not ideal. It's great for picking off varmints and smaller animals like coyotes though.
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