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Quoted: Its possible that they were legit. Slap ammo is old, most of It is from the 80s. Also a lot of it was stored in the hot, dry Mid East shitholes where it was used. Corrosion and power degradation are pretty common in the legit rounds. Its also possible that the powder stabilizes decomposed and instead of slowing the burn rate detonated and accelerated it. It could have been a questionable handled, but its surprisingly hard to that significantly overcharge a 50bmg case using standard powders View Quote View All Quotes View All Quotes Quoted: Quoted: Who made these particular ones is a better question. They may need some kinetic counseling. Its possible that they were legit. Slap ammo is old, most of It is from the 80s. Also a lot of it was stored in the hot, dry Mid East shitholes where it was used. Corrosion and power degradation are pretty common in the legit rounds. Its also possible that the powder stabilizes decomposed and instead of slowing the burn rate detonated and accelerated it. It could have been a questionable handled, but its surprisingly hard to that significantly overcharge a 50bmg case using standard powders He did recover some projectiles that were clearly tungsten, so he didn't get scammed on those. |
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Quoted: Its possible that they were legit. Slap ammo is old, most of It is from the 80s. Also a lot of it was stored in the hot, dry Mid East shitholes where it was used. Corrosion and power degradation are pretty common in the legit rounds. Its also possible that the powder stabilizes decomposed and instead of slowing the burn rate detonated and accelerated it. It could have been a questionable handled, but its surprisingly hard to that significantly overcharge a 50bmg case using standard powders View Quote It was a while ago but I seem to recall pull down/surplus sabot bullets being available for .50bmg in the early 2000's late 90's or maybe it was someone making new ones for reloaders. Came with a big warning about not using normal powder loads with it. I have not seen them in a long time though. |
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Quoted: goddamn. between that pressure and the volume of gas that round makes it really is a miracle that dude is alive. View Quote View All Quotes View All Quotes Quoted: Quoted: ~42,000 lbf goddamn. between that pressure and the volume of gas that round makes it really is a miracle that dude is alive. Consider the gun is proofed to that. This shot and the previous ones were likely far in excess. |
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Quoted: Yeah and we’ve all shot blowback 22s and break open shotguns too. So a blowback 50BMG should be good to go! Never mind AR locking lugs aren’t threads. View Quote View All Quotes View All Quotes Quoted: Quoted: Quoted: I hadn't seen that design before seeing this video. Wow. Not sure you could pay me to shoot that, honestly. As pointed out earlier, have you ever shot an AR-15? If you have, you have "shot that design". Yeah and we’ve all shot blowback 22s and break open shotguns too. So a blowback 50BMG should be good to go! Never mind AR locking lugs aren’t threads. Exactly. That this dude thinks the gun that blew up is the same thing as an AR because there’s some threads on the upper receiver for the barrel nut and the buffer tube is hilarious. ETA: and the way the barrel extension threads on and interacts with the bolt and the forces involved is nothing like a screw on cap with essentially nothing behind it holding the round in the chamber |
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Quoted: Consider the gun is proofed to that. This shot and the previous ones were likely far in excess. View Quote yep. its impossible to tell exactly how much pressure it took to make that happen. those tangs, the one's that almost killed him, also saved him. had they not been there, the cap would have gone through his head.. that being said if they ran the length of the receiver they probably wouldn't have come off at all. |
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That just looks like a sketchy design. Looks about 12 TPI with maybe 5 thread engagement with cap screwed on .
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Quoted: There are standard formulas using white supremacist math to determine holding forces with interference fit joints. Not different really than spec'ing the strength required of a lug, bolt, or any other part. View Quote View All Quotes View All Quotes Quoted: Quoted: How would a press fit joint be figured? Steyr barrels are pressed into the receiver There are standard formulas using white supremacist math to determine holding forces with interference fit joints. Not different really than spec'ing the strength required of a lug, bolt, or any other part. Now you did it, you mentioned math. Haven't you been paying attention to the nrws? We don't need math. |
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Quoted: With a hell of a lot more thread engagement, and an actual torque spec, with a hell of a lot less bolt thrust, and also with a big hunk of cast or forged aluminum preventing it from traveling toward your face. There is no getting around how bad this design is. View Quote View All Quotes View All Quotes Quoted: Quoted: Barrel extension attached to barrel how? With a hell of a lot more thread engagement, and an actual torque spec, with a hell of a lot less bolt thrust, and also with a big hunk of cast or forged aluminum preventing it from traveling toward your face. There is no getting around how bad this design is. Yea....the only thing these 2 have in common is that they are both threads that are located on guns, horrible comparison. |
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i know nothing of Serbu 50 cals since I have a Barrett M82A1, but are their guns typically decent and budget-friendly i assume?
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Quoted: Having the recoil be absorbed by nothing but those end cap threads seems more than a little suspect. I wouldn't be too keen on trusting those even before seeing this video. Isn't there a theoretical maximum pressure a given caliber can physically have, given powder types and case volume? Why wouldn't they add a safety margin equal to that maximum? The guy said normal 50 cal pressure is 55,000psi and that this round was probably 85,000psi. I know over building has a cost but this guy almost died and by all accounts should have. View Quote There is a safety margin. In order to get that PSI you would have to be way over charged. This would have went kaboom in a barret as well. |
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Quoted: You're supposed to say "I'm an engineer not a communications major." View Quote View All Quotes View All Quotes Quoted: Quoted: Quoted: Clamping force with a bolt action will be insignificant as the lugs are not preloaded much when closed on a round. Or maybe I'm misunderstanding what you mean by clamping force. Also I don't see how clamping force plays much in the role of a what is essentially a pressure vessel design with a cap (lug or threads) assuming proper headspace. I don't know how to state it any more simply than I already have You're supposed to say "I'm an engineer not a communications major." He pretty much did. |
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Quoted: goddamn. between that pressure and the volume of gas that round makes it really is a miracle that dude is alive. View Quote View All Quotes View All Quotes Quoted: Quoted: ~42,000 lbf goddamn. between that pressure and the volume of gas that round makes it really is a miracle that dude is alive. It’s a miracle his Dad (and his velociraptor) are still alive as well. |
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I feel like the partial blaming of the nitride mentioned earlier in this thread is bullshit.
Is it possible to experience hydrogen embrittlement from improperly coated/treated steel parts? Sure. But proper coating and post treatments eliminate that risk. Look at the literally millions of full nitride or chromed AR15 BCGs market. There weren’t a rash of KBs when most MFGs switched from phosphate to chromed or salt bath nitrided BCGs & barrels over the years. I think this is solely a combination of what happens when shooting unsafe ammo in a design that would be predictably unsafe if it were to fail. |
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Quoted: I feel like the partial blaming of the nitride mentioned earlier in this thread is bullshit. Is it possible to experience hydrogen embrittlement from improperly coated/treated steel parts? Sure. But proper coating and post treatments eliminate that risk. Look at the literally millions of full nitride or chromed AR15 BCGs market. There weren’t a rash of KBs when most MFGs switched from phosphate to chromed or salt bath nitrided BCGs & barrels over the years. I think this is solely a combination of what happens when shooting unsafe ammo in a design that would be predictably unsafe if it were to fail. View Quote I think the nitride post was in response to something else, not the gun from this video. |
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Quoted: There is a safety margin. In order to get that PSI you would have to be way over charged. This would have went kaboom in a barret as well. View Quote View All Quotes View All Quotes Quoted: Quoted: Having the recoil be absorbed by nothing but those end cap threads seems more than a little suspect. I wouldn't be too keen on trusting those even before seeing this video. Isn't there a theoretical maximum pressure a given caliber can physically have, given powder types and case volume? Why wouldn't they add a safety margin equal to that maximum? The guy said normal 50 cal pressure is 55,000psi and that this round was probably 85,000psi. I know over building has a cost but this guy almost died and by all accounts should have. There is a safety margin. In order to get that PSI you would have to be way over charged. This would have went kaboom in a barret as well. Where that force goes is kinda important. |
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Wow what a story. So glad he is recovering well. God Bless his family and himself. I'm sure his Family was a wreck after the incident.
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Quoted: Not the lugs. The barrel extension is attached to the barrel how? View Quote View All Quotes View All Quotes Quoted: Quoted: Quoted: Quoted: I hadn't seen that design before seeing this video. Wow. Not sure you could pay me to shoot that, honestly. As pointed out earlier, have you ever shot an AR-15? If you have, you have "shot that design". Compare the shear area, fit/engagement and effective pressure area in an ar-15 bolt and the failure modes and effects from a sheared lug in that design to those in this design. Incorrect. Not the lugs. The barrel extension is attached to the barrel how? Substantially differently, from a design perspective, as well as from a physical modeling/mathematical perspective, and especially from the perspective of failure modes and effects/design risk. I'm very well aware of how AR-15s are constructed and function. |
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Quoted: I think the nitride post was in response to something else, not the gun from this video. View Quote View All Quotes View All Quotes Quoted: Quoted: I feel like the partial blaming of the nitride mentioned earlier in this thread is bullshit. Is it possible to experience hydrogen embrittlement from improperly coated/treated steel parts? Sure. But proper coating and post treatments eliminate that risk. Look at the literally millions of full nitride or chromed AR15 BCGs market. There weren't a rash of KBs when most MFGs switched from phosphate to chromed or salt bath nitrided BCGs & barrels over the years. I think this is solely a combination of what happens when shooting unsafe ammo in a design that would be predictably unsafe if it were to fail. I think the nitride post was in response to something else, not the gun from this video. The Serbu Nitriding PSA was from a year ago and has nothing to do with Scott's kaBoom. Other than it has Serbu stating the RN50's breech cap, as mfg'ed by them, is supposed to have "at least a safety factor of 3x, meaning its three times as strong as it needs to be." |
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Threads are not nearly as strong when used like they are on the RN50. No preload = pulled threads everytime.
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Quoted: The problem here isn't the factor of safety. This was so catastrophic that it looks the same would have happened even if it was built to handle 110ksi. The problem is that the cheap design has no additional safeguards in the event of catastrophic failure. Because there is no large bolt, all that energy is directed to accelerating a small cap, which essentially becomes a very good projectile. There is no receiver to contain the debris/projectile so it has a clear path to the shooter other than 2 small ears which also became projectiles. None of this is true with a proper 50 BMG design from M99 to M107 View Quote This is the crux of the matter right here. Any weapon can be destroyed with over pressure ammo. It the systems put in place through engineering that makes the splodey bits splode away from you is what matters. The Sebru clearly has none of these systems in place. |
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Quoted: This is the crux of the matter right here. Any weapon can be destroyed with over pressure ammo. It the systems put in place through engineering that makes the splodey bits splode away from you is what matters. The Sebru clearly has none of these systems in place. View Quote View All Quotes View All Quotes Quoted: Quoted: The problem here isn't the factor of safety. This was so catastrophic that it looks the same would have happened even if it was built to handle 110ksi. The problem is that the cheap design has no additional safeguards in the event of catastrophic failure. Because there is no large bolt, all that energy is directed to accelerating a small cap, which essentially becomes a very good projectile. There is no receiver to contain the debris/projectile so it has a clear path to the shooter other than 2 small ears which also became projectiles. None of this is true with a proper 50 BMG design from M99 to M107 This is the crux of the matter right here. Any weapon can be destroyed with over pressure ammo. It the systems put in place through engineering that makes the splodey bits splode away from you is what matters. The Sebru clearly has none of these systems in place. The term I have heard tossed around for this is "failing gracefully." For example, I've read that some triple biscuit woodworking joints take more force to destroy than ... what was it, the through joints that are pinned (eludes me atm) ... BUT ... the biscuit joints, when they went, gave no warning at all, the wood grain simply separates catastrophically. The other joint gets loose and wobbles and you can "see it coming." GOOD designs take into account that they WILL fail and are designed to ... fail ... gracefully. Not brutally. |
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Failed To Load Title TNT in case as "military trap" to blow up enemy Is that a thing? This CRS firearms guys sounds crazy... have not watched enough of his videos to decide if he is. |
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Dang that was a close call. Looks like Ill be selling off all my slap!
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I enjoy his videos and he seems like a guy I'd enjoy hanging out with. Really glad he's ok. God was with him that day for sure.
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Quoted: https://www.youtube.com/watch?v=fEnU0JyhR84 TNT in case as "military trap" to blow up enemy Is that a thing? This CRS firearms guys sounds crazy... have not watched enough of his videos to decide if he is. View Quote Yes. https://militaryhistorynow.com/2016/11/18/project-eldest-son-the-secret-u-s-scheme-to-sabotage-charlies-ammo/ |
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In the video, as he loads the final round and closes the receiver (right around 3:16), there's a piece of metal or something that gets ejected downward/forward and bounces off the table on the right-hand side.
What is that? |
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Gun Jesus's take on it.
Earth-Shattering ka-Boom! How (and Why) Guns Explode |
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Quoted: https://www.youtube.com/watch?v=fEnU0JyhR84 TNT in case as "military trap" to blow up enemy Is that a thing? This CRS firearms guys sounds crazy... have not watched enough of his videos to decide if he is. View Quote Guntube Fred Durst? @brasscrossedrifles |
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Quoted: lol. Apparently he's not the first to call CRS Fred Durst. Looks like CRS is playing ambulance chaser (going after the YouTube views). View Quote BCR is the first poster on here I saw to call him that. I thought it was hilarious because its a perfect descriptor. I have been called a man of culture before. |
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Quoted: Wow! That is enough pressure to blow that cap off w/o a bore obstruction. View Quote I've got 160k psi with a 750 gr bullet, 100% fill rate and the book OAL. Peak pressure was at 0.2 ms. However, QL is obviously not validated for such high pressures. It's a shame pressure barrels are not more common. In Finland the government proof house accepts proofing lots of ammo from anyone, including private citizen hand loaders It's not even that expensive. They will give you all the pressure and velocity data in their report, not just if it passed CIP values or not. However, if you give them a bomb like that to proof and it wrecks their pressure barrel, I guess you are paying for the barrel and PE transducer as well. It would have been interesting to see the other casings from the SLAP rounds before the one with the KB. Were there any pressure signs in them? In general the idea that you try to judge cartridge pressure limits from fired rounds is though more art than science, only a pressure barrel with a properly calibrated transducer will tell you that reliably. Personally I don't shoot suspect ammo in any rifles and very sparingly in pistols. But after shooting the M2000 heavy sniper rifle with standard ball ammo, I wouldn't even entertain the idea of shooting mystery rounds commonly counterfreited with it. It's like lighting off a ground burst simulator charge in the front of your face. If you don't respect the power of that caliber in your choices of ammo, you are kind of nuts. |
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After watching the video multiple times and looking at screen captures that were posted here, the ammo isn't surplus it's reloads!
The SLAP-T projo is real but by looking at the brass and the crimp, you can see that the rounds are reloads. Whoever loaded it had no clue of what they were doing and the guy in the video had no clue of what he had. He even said it in the video!!! Why he shot questionable ammo at all screams clueless! Just because you own firearms doesn't mean that you're an expert in ammunition! If you didn't load it, why would you shoot it in your firearms?! Again, clueless! This is one of the first things you learn about reloading or buying ammo. I'm not shocked that there's people like him out there. What scares me the most is that people will think he's an expert because he has a Youranidiottube channel!!! He should have a warning about not being a professional in anything gun related on his channel that plays before, during and after his videos! Again, he's lucky to be alive and yeah it's bad that he got hurt but stupid hurts for a reason! |
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Damn.
Firing .50 SLAP mystery-meat rounds just got crossed off of my list. |
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I think the guy must have his jugular vein and carotid artery mixed up.
He talked about severing his jugular vein, but then talked about after repairing it, and unclamping, they were worried about a clot going to his brain causing a stroke. The jugular takes blood away from the brain, the carotid is what goes to the brain. |
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Quoted: those tangs, the one's that almost killed him, also saved him. had they not been there, the cap would have gone through his head.. that being said if they ran the length of the receiver they probably wouldn't have come off at all. View Quote If they ran the length of the receiver, you wouldn't be able to cock the hammer in it's current design. You would need a side mounted stud attached to the hammer and a circular cut in the side for it to run in.....similar to the cocking setup of an MBA Gyro Jet Tony |
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Quoted: With a hell of a lot more thread engagement, and an actual torque spec, with a hell of a lot less bolt thrust, and also with a big hunk of cast or forged aluminum preventing it from traveling toward your face. There is no getting around how bad this design is. View Quote View All Quotes View All Quotes Quoted: Quoted: Barrel extension attached to barrel how? With a hell of a lot more thread engagement, and an actual torque spec, with a hell of a lot less bolt thrust, and also with a big hunk of cast or forged aluminum preventing it from traveling toward your face. There is no getting around how bad this design is. So you agree the basic attachment of the breech to the barrel is the same. Containment of an overload is a different matter. |
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Quoted: Exactly. That this dude thinks the gun that blew up is the same thing as an AR because there’s some threads on the upper receiver for the barrel nut and the buffer tube is hilarious. ETA: and the way the barrel extension threads on and interacts with the bolt and the forces involved is nothing like a screw on cap with essentially nothing behind it holding the round in the chamber View Quote Good thing you added that EDIT. |
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Quoted: So you agree the basic attachment of the breech to the barrel is the same. Containment of an overload is a different matter. View Quote View All Quotes View All Quotes Quoted: Quoted: Quoted: Barrel extension attached to barrel how? With a hell of a lot more thread engagement, and an actual torque spec, with a hell of a lot less bolt thrust, and also with a big hunk of cast or forged aluminum preventing it from traveling toward your face. There is no getting around how bad this design is. So you agree the basic attachment of the breech to the barrel is the same. Containment of an overload is a different matter. A spoon and an aircraft carrier are made of the same basic material. What kind of conclusions can we draw from that? |
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Quoted: Substantially differently, from a design perspective, as well as from a physical modeling/mathematical perspective, and especially from the perspective of failure modes and effects/design risk. I'm very well aware of how AR-15s are constructed and function. View Quote Blue: Explain please. One is a threaded extention, the other a threaded cap. Instead of smartass answers, help us(me) understand. For clarity, I am not asking about containment and redirection of a failure. |
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Quoted: “Old unknown origin rounds (reloads? Storage?) in retrospect bad idea to shoot rounds of unknown province. View Quote This is true for any caliber as well. I remember seeing the RN 50 serbu video. I thought it was a neat design. Definitely does not fail catastrophically in a safe direction. I wonder how a double rifle or ruger no 1 would fail in a similar over pressure scenario. Also a great example of safety glasses saving an eye. |
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I like the guy. I bought the shirt to support him.
But man, he said several times "I had no way of knowing that round was unsafe". Come on man, this is exactly why you don't shoot ammo of unknown origin. |
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Quoted: So you agree the basic attachment of the breech to the barrel is the same. Containment of an overload is a different matter. View Quote View All Quotes View All Quotes Quoted: Quoted: Quoted: Barrel extension attached to barrel how? With a hell of a lot more thread engagement, and an actual torque spec, with a hell of a lot less bolt thrust, and also with a big hunk of cast or forged aluminum preventing it from traveling toward your face. There is no getting around how bad this design is. So you agree the basic attachment of the breech to the barrel is the same. Containment of an overload is a different matter. Not torqued = not the same. Also, butted against an upper receiver which is between shooter and breach is not the same as open direct line from breach cap to shooter. Also, ratio of amount of thread engagement to amount of pressure is NOT even close to the same. Not sure what you're trying to prove, but you're digging your hole deeper. Is an F150 pulling 10k pounds the same as an F450 pulling a john boat? I mean, they both have engines, four tires, and a trailer hitch, right? eta: Not trying to be a smart ass, as I enjoy discussing minutiae too. It could come down to your definition of "same". Yes, the breach is basically threaded together. No, they're not the same re: strength of the joint in the respective designs and executions regardless of containment. |
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Damn! Glad he's sorta ok.
He is one of the very few gun tubers I actually watch. |
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Quoted: This is true for any caliber as well. I remember seeing the RN 50 serbu video. I thought it was a neat design. Definitely does not fail catastrophically in a safe direction. I wonder how a double rifle or ruger no 1 would fail in a similar over pressure scenario. Also a great example of safety glasses saving an eye. View Quote View All Quotes View All Quotes Quoted: Quoted: “Old unknown origin rounds (reloads? Storage?) in retrospect bad idea to shoot rounds of unknown province. This is true for any caliber as well. I remember seeing the RN 50 serbu video. I thought it was a neat design. Definitely does not fail catastrophically in a safe direction. I wonder how a double rifle or ruger no 1 would fail in a similar over pressure scenario. Also a great example of safety glasses saving an eye. Horribly. Similar to the RN50 there is nowhere "safe" for it to release pressure. |
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