I’ve had way too many troops in class claim that all full auto fire is doomed to climb excessively. With good technique, this is not true. Here are some random examples.
Slow motion:
Long, hand held bursts aren’t particularly useful, but further illustrates the point.
Another demo here:
https://firearmusernetwork.com/2014/12/10/full-auto-fire-demonstration/
Firearm User Network 
Ted Sames II
Dec 05, 2014 @ 11:37:19
Excellent presentation. The current LMGs are very well designed indeed. They are heavier and are supported by bipods though. I remember vividly the Viet nam-era M-16s we had (78-81) with the thin skinny bbs. In prone, you had to pull them down with the sling to keep them from climbing while on full auto. The bbl would get hot and you could actually perceive bbl bending when pressure was exerted down. The first shot would make a hit and the rest would go over the target if you did not keep the pressure on the sling. The new M-16s and M-4s are excellent. But…in the standing position, the operator has to be trained in proper positioning to fire accurately on full auto. I can tell instantly if a person has had auto rifle training from a professional instructor. Proper stance and balance is #1 in full auto. During a Machinegun Shoot, I was appalled then…I had to relax….these people are having fun! One of our LARGE SWAT guys–using proper tech—could shoot the AK-47 like a MP-5…proper method is paramount. Never the less, full auto in rifles is a very short range and emergency endeavor. I was reading ‘Carnivore’ and author was explaining how the Iraqi troops had poor training and would extend their rifles out without a cheek weld and empty the mag at our soldiers. They were lousy shooters because of improper technique and use of all types of firearms.
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John M. Buol Jr.
Dec 05, 2014 @ 16:17:44
>> Viet nam-era M-16s we had (78-81) with the thin skinny bbs. In prone, you had to pull them down with the sling to keep them from climbing while on full auto.
Yes, certain design features will help or hinder this.
My point was that full auto doesn’t automatically climb. All recoil is an equal and opposite reaction and that is straight back. With a good position the sights and barrel will recover back to the point of aim. The first video with the slow motion demonstration shows this. If it doesn’t and shots go wild, be it up or any other direction, it is a position error.
>> During a Machinegun Shoot, I was appalled then…I had to relax….these people are having fun!
I’m all for having fun, provided actual training gets accomplished as well.
>> They were lousy shooters because of improper technique and use of all types of firearms.
Iraqis are not the only military guilty of this.
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Ted Sames II
Dec 06, 2014 @ 11:54:11
Very good! Everything depends on the design of the rifle or LMG. The 3rd Law of Thermodynamics applies if the bbl and the stock is in a straight line and nothing interferes with this alignment as pistons, bolts, accessories which weigh the weapon down at certain points. The French made a LMG which the design was completely contrary to this concept. We called it the Potato Digger because upon recoil, it would dig itself into the ground. It was probably the worst designed LMG ever made. The BAR was much better in recoil control.
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Full Auto Fire Demonstration | Firearm User Network
Dec 10, 2014 @ 21:17:48