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Posted: 9/21/2019 8:00:47 PM EDT
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In class today, one of my students had a ka-boom with Frontier 5.56mm ammo. Upon further inspection, his YHM Turbo can was fucked up.
Can someone advise if these cans are repairable? End cap looks good, no exits out the side of the can, just the damaged baffles... see photos below. 
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How did the end cap make it out unscathed? Must have a much larger diameter than the core. I'll try to get a pic today as we have another day of class. |
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Crap I have a 100rd box of that same lot #.  Prior to the case failure he had a jam requiring a mortaring of the rifle to clear. I observed a rather distinct carbon ring on the unfired case at the neck/shoulder junction. I would suspect crud continued to build and eventually created a situation where the case neck simply couldn't release the fired bullet. This pressure spike, added to the possibility of already high pressure ammo, and the results are what could be expected. |
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Quoted: ...the shooter's rifle was EXTREMELY dirty before class... irresponsibly dirty... the suppressor was new and added to the filth.
Prior to the case failure he had a jam requiring a mortaring of the rifle to clear. I observed a rather distinct carbon ring on the unfired case at the neck/shoulder junction. I would suspect crud continued to build and eventually created a situation where the case neck simply couldn't release the fired bullet. This pressure spike, added to the possibility of already high pressure ammo, and the results are what could be expected. |
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The two responses from Hornady regarding their ammo causing KABOOMS is them placing blame on dirty rifle chambers.  If excessive carbon buildup in the chamber/neck/throat is the root cause.... that begs the question why aren't we seeing kabooms with all the other M193's out there? With the huge number of people that run suppressors, and gunk up their guns until they stop running, with nary an issue? Additionally, I'd like to hear how carbon causes the projectile to strike a baffle. |
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Quoted: However, they said carbon buildup led to OOB discharge. None of the reported cases were fired OOB. If excessive carbon buildup in the chamber/neck/throat is the root cause.... that begs the question why aren't we seeing kabooms with all the other M193's out there? With the huge number of people that run suppressors, and gunk up their guns until they stop running, with nary an issue? Additionally, I'd like to hear how carbon causes the projectile to strike a baffle. As an avid reloader I'm fully aware (I'm sure you are too) of the dangers of brass stretch to the point the case mouth can get pinched, the obvious result is a pressure spike as the pressure builds fighting the case for bullet release. I could not help but notice a rather distinct carbon ring on an unfired, previously stuck, case. I've never seen such a thing before to that degree. I'm just spit-balling possible contributing factors for the sake of discussion... it's quite plausible that crap built up in the throat could very easily restrict and/or prohibit bullet release resulting in a dangerous pressure spike... then add to that already suspected hot ammo. I have posted an opinion on here before and I will reiterate it again... almost all (never say all and never say never right?) the case failures I've seen in my classes, four now I believe in total, as well as all the ones I've read about seem to be preceded by a malfunction... gun malfunctions, shooters clears it, and with a round or two boom... shit happens. Just seems to me it's quite reasonable to suspect case mouth restriction/pinch, whether it be from gunk, brass flake, jacket flack, etc., results in pressure spikes thus shit getting damaged. In the end, I have no idea what caused it, but I will say 5k-6k between cleanings certainly didn't help the situation. |
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Additionally, I'd like to hear how carbon causes the projectile to strike a baffle. |
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That's a great question. (I'm just following along 'cause it's interesting.) I wonder - but have no idea - if it's possible that the "event" caused the projectile itself to obturate in some fashion that it was incredibly unstable the moment it left the muzzle. The bullet simple did not leave the bore with the usual amount of pressure behind it, which means a lower velocity, which means less stable. Keep in mind, the barrel was at minimum recommended length. |
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