1) Minigun - is raycast weapon.
2) And tracers don`t sync with real mg hits.
3) mg is instant-hit weapon.
So... Aiming mg - complecty non intuitive.
Digget on forum:
So let's say your raycast gun has a muzzle velocity of 200m/s. If you're moving up at a rate of 5m/s and your target is 600m away, you will need to aim 15m below where your target actually is in order to hit it (EDIT: Because it would take 3 secs for the weapon to travel 600m with a muzzle velocity of 200m/s, so 5m/s * 3s = 15m). The thing is, your opponent's velocity doesn't matter for the gatling. You could both be moving up at 5m/s such that your relative velocities are 0m/s, but you'll still have to aim 15m below it to hit. It's fairly counterintuitive, and kind of ignores physics in that regard.
Yep, i know, old players an hi-end gunners - can do 90~100% hits. But it like voodoo magick.