Strange that those who should know better, who are highly qualified in their respective technical armaments rolls, always make hard work on selecting the right calibre. I am sure there are those on this site that will remember days gone by when weapons were built (as they should be) around the round to be used NOT the other way round.
Interesting times. The 7.62 x 51 was designed to stop a man in his tracks, these days they seem to be satisfied with the softer, feather approach......................... "Lets not hurt them".

I think I had better start drinking whatever they are having