Pretty sure soldiers are advised to keep their weapons in burst mode, or single shot these days. In Nam our guys tended to hose the jungle with mag after mag and hit exactly nothing. The services learned to encourage carefully aimed shots, or short bursts. The M-16/M-4 has a 3-shot burst mode on the selector. One trigger squeeze, 3 shots come out. You have to squeeze again for another 3.
I saw a demo long ago where an instructor hip-hosed a hillside with a half dozen life-sized human targets on it, and hit nothing but the hillside. He clicked over to single shot and fired one shot center-mass on each target in just a few seconds.
Ya know, I'd be interested to see what kind of groups the Mythkids were getting in that test! They never showed us what they were shooting at!