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Since the main charge against .223 is the lack of enetration on cover and considerable deflection on even the lightest obstacles, how about necking it up? Simply replace the 55gr or 62gr 5.56mm bullet with a 100gr 6.5mm or a 120gr 7.62mm bullet. Would need to change barrels and sights on the AR15, probably magazines as well (I think the neck size matters in double-stacks).
End up with a heavier projectile that penetrates hard cover better, still yaws nastily as any spitzer would, drifts less in cross-wind. Down sides, less fragmentation in the tissue, more curved trajectory. Do you think that such a change would improve the overall performance of the AR15?
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