M80 FMJBT, standart NATO ammo, Lake City, 91. 146 +-1 gr bullet, WC 846 propellant. Ie same as used in 7.62 MGs and every other rifle in that cal, it's mass production cheap ammo, not some M118SP. Rifle itself is approx 2moa, ammo is 4moa or less. Nonetheless those repeated hits are grouped 1.5 moa and less.
My "beat that" remark was aimed at the try to take a mid-class semi-auto rifle with milsurp ammo and get it hit human sized targets at long ranges - constantly.
Guntech, that's an AI AE? I'd expect that kind of rifle to hit small targets at 1000m range. If not then the shooter is not up the task.