I have seen a lot of "this, and that, happened on the range". That would be great if wars were fought on rifle ranges. I have carried both the M14, and the M16 in combat operations. In fairness, I should mention, I used the M16 only one time. It jammed on the third round, firing in semi auto mode. I never tried it again. In answer to the, just keep it clean, argument. Let me ask. Have you ever tried to do this in the field, in the middle of a jungle? In Vietnam you could literally, pour gun oil over the thing, and the next morning there would be a thin coat of rust on all metal parts. We went so far as to put Turtle wax on the external parts to slow this process. It only slowed it a little.
Also I see a lot of concern about wind. I don't remember once being concerned about the wind. What I did have reason to think about, was bullet deflection caused by hitting a twig, or some elephant grass. Being heavier, and "hotter", The 7.62 was less prone to deflection.
Mostly, combat came down to, you see a bunch of muzzle flash's in the bushes over there. You shoot at them. If you hit something, you want him out of the fight. Not bleeding, and firing back.