50 BMG Round Explosion

I have a different take. M903 SLAP was developed to increase the armor defeating capability of the M2 machinegun. While it was adopted in the mid-80's, it was not commonly fired in training, and perhaps it was different in the Marine Corps. No one I have talked to in the Army remembers having any issued during the Gulf War.

Policy changes concerning the disposal of surplus ammunition have gone back and forth, currently only ammunition useful to other government agencies escapes DEMIL.

Even the rules on demilitarization have changed. Folks may remember companies which pulled down ammo and reloaded it. Then DoD required the brass to be crushed.

This makes the pedigree of the ammunition he was shooting very suspect.

Was it ammo left over after training and some GI stuck a few rounds in his pocket for souvenirs?

Was it ammunition scheduled for destruction and purloined by a contractor? If that is the case, it is possible the ammo being destroyed was a "bad lot" meaning the Army had condemned it as unsafe.

Was it ammo reloaded using pull down components and who knows what data?

The few rounds he shot were inconsistent. One exhibited an excessive amount of flash before the accident round. My view is it was over pressure ammunition that caused the event. I don't suspect a Barrett or a Browning would have fared any better than the Serbu did.
 
Last consideration, as a tanker I fired plenty of sabot ammo through rifled and smooth bore tank guns. This paper explains the effects of muzzle brakes on fin stabilized long rod penetrator type discarding sabot ammo. Rifled guns firing APDS-T like the M68 105 lack muzzle brakes. The British 17 pounder durung WW2 and the US 90mm had muzzle brakes but suffered accuracy problems with APDS-T

It might be interesting to take a ggod look at the muzzle brake on the Serbu. SLAP was approved for the M2 machine gun but not the M85. Are the "petals" of the sabot beginning to touch the brake rather than coming off cleanly upon exit like they would on a "bare" muzzle?

[PDF] Influence of muzzle brakes upon the trajectory of fin-stabilized projectiles | Semantic Scholar
 
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It's a yellow butterfly. It enters the frame from the right (behind Scott's back) at 3:17.

That's no butterfly. It comes into the image very hot and bounces off the top of the table.

I don't typically watch this channel because he does some dumb videos. In this case, he ignored a lot of signs that there was either an issue with the gun or the ammo. He says he noticed that the "fireball" was abnormal. He also says that he noticed the rounds were going all over the place. These are pretty basic issues that a shooter learns pretty quickly to notice and then stop to determine what's going on.
 
I have a different take. M903 SLAP was developed to increase the armor defeating capability of the M2 machinegun. While it was adopted in the mid-80's, it was not commonly fired in training, and perhaps it was different in the Marine Corps. No one I have talked to in the Army remembers having any issued during the Gulf War.

Not to take issue with your considerable (appropriate to an
old, but not TOO old tanker :D) sabot knowledge & experience,
I suspect some .50 SLAP rounds were used in Afghanistan, based
on numerous vids. Recipients exhibited temporary stretch cavities
grossly in excess of normal exterior dimensions, with liquifaction
and violent dispersal of contents, suggesting velocities well over 2700 f/s.

Regarding the muzzle brake/sabot interaction, here's a
direct link to entire study:

https://apps.dtic.mil/dtic/tr/fulltext/u2/a162962.pdf

That could explain the variable accuracy in the vid. It
wouldn't, of course, increase pressure within the bore
or increase strain on the breech plug.
 
...I suspect some .50 SLAP rounds were used in Afghanistan, based on numerous vids. Recipients exhibited temporary stretch cavities grossly in excess of normal exterior dimensions, with liquifaction and violent dispersal of contents, suggesting velocities well over 2700 f/s.

I wonder if you might be referring to a somewhat similar cartridge specifically designed for long range work using the M107 rifle.

Ammunition Cartridge, Caliber .50 BMG, Armor-Piercing-Incendiary, Mk 211 Mod 0

A so-called "combined effects" cartridge, the Mk 211 Mod 0 High-Explosive-Incendiary-Armor-Piercing (HEIAP) cartridge contains a .30 caliber tungsten penetrator, zirconium powder, and Composition A explosive. Cartridge is identified by a green tip with a grey ring, and can be used in any .50 caliber weapon in US inventory with the exception of the M85 machine gun.

Thanks for the rest of the study. The trick with discarding sabots has always been having them come off without affecting the accuracy of the sub projectile.
 
Warning: Old Military Guys in Thread-Drift

I wonder if you might be referring to a somewhat similar cartridge specifically designed for long range work using the M107 rifle.

Ammunition Cartridge, Caliber .50 BMG, Armor-Piercing-Incendiary, Mk 211 Mod 0

A so-called "combined effects" cartridge, the Mk 211 Mod 0 High-Explosive-Incendiary-Armor-Piercing (HEIAP) cartridge contains a .30 caliber tungsten penetrator, zirconium powder, and Composition A explosive. Cartridge is identified by a green tip with a grey ring, and can be used in any .50 caliber weapon in US inventory with the exception of the M85 machine gun.

.

Dunno...the vids were semi-sorta backchannel stuff, by
very qualified snipers. Don't recall any flash on impact,
and the scope vids were pretty clear--definite possibility,
tho.

Did a quick search and Wikipedia (gasp!) has a pretty good
write up on the Raufoss MK211. A study by Norwegian
military is cited, which concluded the round would exit a
human body before the incendiary & explosive components
initiated. Tried the link to study, got "Service Unavailable".

http://www.mil.no/multimedia/archive/00036/Virkningen_av_12_7mm_36061a.pdf

So...maybe back to a simple ole SLAP...
 
That's no butterfly. It comes into the image very hot and bounces off the top of the table.


It sure is. It is not on the table, but behind the table. You can clearly see it coming in from the right, and just before the moment you think it bounces off the top of the table, it is (seemingly) under the table above Scott's lap. If you watch the video at normal speed in high resolution, it is obvious that it is just a butterfly flying through the frame behind Scott and the table, probably a Southern Dogface.
 
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