Some things I was trained on in the military: 2 tracers at the bottom of the mag and 2 behind the first 2-3 rounds to help your element to determine point of contact. Look carefully into laws concerning tracer rounds for civilian use. Do 20 push ups and a 50 yd sprint before engaging a target. Do the same, but leave your weapon at the firing lane w the mag empty and 2-3 rounds near it, load the mag, engage the the target. Do the same again, but have your buddy sabotage your weapon for a misfire. Your breathing and your dexterity will be very different under stress/adrenaline, than it is under normal range time. When and if you can hit 800m target with a military issued M4 and you have the range space available, consider sprinting from 1000 meters and shooting 3 rounds from prone, sprint 200 more meters shoot 3 from prone, 3 from haji sitting position. Don't stop now, sprint 200m more and now do 3 rounds from prone, haji sit, kneeling and standing, time yourself, examine your shot groups and do better next time.