I've pretty much always been a Bolter but the last couple of games I've been trying the DP-28. I'm kinda liking it...and I think I am going to work on mastering (or at least becoming somewhat competent) with the LMG class.
The best tip I can give you is to favour 100m+ engagements. What you want to do is be shooting at people that can't run very far away from your aim point because you can't track the gun very far. I know that sounds counter-intuitive, but the closer he can get, the safer the enemy is. He has more ways to avoid getting hit.
Your gun is accurate enough to hit targets like that very easily with a three round burst or even single shot, especially if you use shift-zoom to get an accurate sight picture. Don't be afraid to change the gun's zero from 100m to 200m for running around. You're slower than everyone else, anyway, so you'll be behind them a fair distance. Aim to stay within 50m or so behind or in front of them, but always offset so that you can cover their entire frontage barring obstructions.
For long range hunting, the next setting on the sight is 400m. This shows you the difference between the rifle and the gun. The rifleman is meant to stay close to the enemy, but the gunner is meant to range around covering wide swathes of territory via positioning and movement. You're following your squad's movements, but you're usually moving more. You may have to run out further to cover approaches or whatever.
When you aim, don't aim for centre mass. Once again, this is different from what you do with other weapons. If you aim at the centre, your first bullet will hit. But the second may miss high, and the third definitely will. Get used to what the grouping is, and aim to walk the rounds onto the target, rather than off. Aim at his hips or knees or even feet. At 100m or so, I'm mostly aiming at the knees of a running target.
Think of painting vertical stripes. Track the gun, fire a stripe, track the gun, fire a stripe. This puts a wall of bullets about 2m high everywhere you pull the trigger. If multiple targets are bunched up, do not spray. Keep painting vertical stripes. You will kill them faster because the gun never gets out of control and every bullet has an equal chance to hit something vital.
When the gun goes bang, everyone looks. Always. This is the real suppression effect of a machine gun. When you fire, you announce yourself to the world like the Jaws theme. Don't warn them. You want them to go "holy crap, an mg over there just killed three guys in a second, I won't go there". Then you move to where he
does go. Now you have suppressed the enemy from going to one place, directing him to where you want him, and then you can surprise him again.
Let me set the mood for you: The machine gun is the scariest mother on the battlefield because it kills people. In fact it kills the most people of all weapons on the battlefield. When the assault troops run into the objective, you want them to find dead bodies. If they have to kill anyone, then you have failed. Never do anything that hinders your ability to kill people. Don't get seen. If the enemy knows where you are, move. Every round counts. People died to bring them to you. That's how to think like a gunner.
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I just thought a way you can test yourself on the gun. Do the training mission and do the MG part. They use three closely bunched targets for each location. This is your "no more than three bursts from one location" simulator. When you shoot at a different set of targets, it's like you displaced around a single target.
So when you try to do it, first try spraying the targets. See what happens. Then try doing three round bursts, but walking them horizontally across the targets trying to get one round on each, as most people do. Then try painting a single vertical 3 round stripe on each target, starting at the knees and letting it rise straight up without fighting it at all.
I am betting you will find that you will hit every target with at least two rounds within a second or two.
Once you are satisfied that this way suits you, then practice a few times on that range, setting the sights properly and so on, for different ranges. Try to get a feel for how rapidly you can fire bursts at different ranges. In close you can almost fire constantly, at 400m you might have to wait a second between each burst for the gun to settle and to adjust your aim. You should be able to engage 5 target groups, killing each target, before reloading. That's 15 kills. You can't get any more suppressed than that.