It is a mix of that players inaccuracy, holding down the mouse button to fire and harmonic vibrations. The devs may know this as "recoil, weapon sway" or just understanding the firearm vibrates. I appreciate their realism. It happens with sniper rifles even firing one round, sniper rifles tuned to have a high rigidity to reduce the amplitude of vibrations at anti-node zones so the bullet is un-affected as it leaves the barrel. Now apply this science to a machine gun and you will get the answer why you survived at 50 Meters. Mix of bad aim, leading, deviation, not using bursts to keep small cone of fire. Sniper 101 lesson on Harmonics in rifles --->
https://www.youtube.com/watch?v=h407yVs ... Un&index=7
Slight movement of half centimeter of barrel vibration or weapon sway < will send bullets farther off to the side of the target the further it is away, so this sends the bullet further off the side of you. Its how you survived. This game does have grazing wounds that seem to take 1% of health not leaving you bleeding, I tested it on people close up to see if they bleed. A stationary clamped gun firing at a fixed aimed distance can measure its groups in minute of angle to show deviation without any movement, there is 60 minutes of angle between 1 degree on a compass.
1 MOA at 100 yards equals 1.047 inches, at 200 yards it equals 2.094 inches (2 x 1.047). To calculate MOA at any distance, multiply 1.047 by the distance in yards and divide by 100. MOA is measured by the distance between where 2 bullets hit using these conversions with caliper dials. 1 MOA is approx 1 inch(1.047) group, .5 MOA at 100 yards will shoot half inch groups based off data for that scope, rifle and caliber. Change any of those factors with a clamped gun you get different results. Put that gun into a humans hands when fighting bullets fly everywhere, there ya go.
https://www.youtube.com/watch?v=5Oiy5Rc ... i&index=13
100 meters with clamped gun will get you 0.1-0.5 MOA difference in bullet hole grouping with a single direct barrel laser brass case bullet hole(brass case with laser pointer instead of bullet to see where barrel is directly pointed). Laser point, fire some rounds, put the laser case back in gun, measure where bullets hit from barrel point of aim.
If you get 0.5-1.0 MOA deviation at 100 meters check measurements at 200 meters zeroed, might be more like 07.-1.2 MOA grouping out of the same fixed point. You can be just as accurate as 100 meters at 200 meters but this is where all factors of vibration, harmonics, bullet rise, chamber temperature, time a powder propellant heats up in a chamber.