It means nothing as far as setting a commonly achieved "maximum effective range".
Of course there have been some amazing shots in the past several years, from various caliber sniper rifles.
Just because one dude whacked a guy from 1268M does NOT however, mean that the max effective range of an M-24 suddenly becomes 1268M. Just like the Canadian sniper hitting at 2475M doesn't instantly change the max effective range on an M-107 to 2475M. It's still 2000M.
It means that they were exceptional shooters, as in, shooting well above the baseline standard for the weapon platforms they were using.
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