Almost since introduction the 5.56×45 NATO has exhibited the qualities of Schrodinger’s Cat, simultaneously being an ineffective battle round while simultaneously being terribly effective to the point where people keep trying to ban it for civilian use. Thousands upon thousands of words, and hours of argument, for both sides have been spent on the subject.
The 5.56 naysayers routinely pull out ballistic tables and show all sorts of lovely numbers about energy in foot pounds remaining at range: http://usacac.army.mil/CAC2/MilitaryReview/Archives/English/MilitaryReview_20120831_art004.pdf and it should be noted that this article makes the “post hoc” fallacy that the 5.56×45 is inadequate because the M14 EBR program was used. The author makes no analysis of what the mix ratio was, and how those rifles were employed, and other tactical considerations. In Afghanistan the SEALs of Seal Team 10 often considered the 7.62×51 inadequate as a sniper rifle platform since they had the 300 Win Mag…
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