He's a lucky guy.
https://www.youtube.com/watch?v=1449kJKxlMQ
Printable View
He's a lucky guy.
https://www.youtube.com/watch?v=1449kJKxlMQ
Fk that ,he s a lucky to be alive.Iv seen a 270 explode on the trigger pull.Guy beside me in a shooting comp,thank god for safety glasses.Blu the bolt face and damaged the scope a bit.
Insane how the secondary fail safe caused the most damage, very lucky to be alive to talk about it. Anyone know if there were over pressure venting ports on the serbu rifles?
Holy sh&t..................... !!!
Sheesh
Rifle builder said it would need 85,000 psi to do that!
Greetings All,
If a more micky mouse type of breeching for a 50 calibre exists I have no idea what it would be. It just looks weak and Heath Robinson to me. Subject to wear and eventual stripping just as happened. I think that the 85,000 lbf/in2 claim was just arse shielding IMHO.
Regards Grandpamac.
holy smoke Batman!!!!!!!
I feel for him,I really do.....he has one HUGE hurdle to overcome the first time he shoots rifle again....it starts with a F and rhymes with grinch...... the mind will be SCREAMING ...what the fcuk are you doing???this hurt last time....dont do it dont do it......
I have to admit I thought the same - no real integrity in that screw-on breech device, if it had been used in conjunction with a back-up locking system it would have been preferable.Quote:
Originally Posted by grandpamac
Still feel sorry for the guy, not a good day at the range but God smiled on him a little what with his father and transport being right there.
Wow
The fail safe was only to close the breech correctly and not an over pressure fail safe
I guess they assumed that in over pressure the barrel stub would expend and the threads would not let go
The back thrust must have been colossal to overcome the shank expansion and strip those threads
I wonder what if any destruction testing was done by the manufacturer ?
I also wonder if there was significant throat erosion starting in the barrel and it was riveting the projectiles
There is never just one thing that goes wrong
It's a cluster F of things that contribute to total failure
I know this from experience
Next time, clamp the 50 cal to a 4 ton table and tie a loonnggg piece of string tied between you and the trigger.
interesting the muzzle flash thing..... some of them rounds were definitely different to others....
.50 BMG aka 12.7x99 doesn't play. I recall the video of a shooter whose earmuff was knocked off his head by a ricochet at 100 yards. Mother duck, that still gives me cold shivers.
https://youtu.be/0ABGIJwiGBc
It was actually 1000 yds although some reports say 2000 yds. At any rate, at 1000 yds you would think you would be safe.
There's a whole lot of stuff on Youtube showing blowups. A lot of blown revolvers.
Some events , you would have to question the competence of the operators.
My bad typing, sorry. Yep 1000 yards / 900m it was. Terrifying!!!
Those glasses sure did their job, plus some.
That was a terrific explosion alright, he was damn lucky the piece that missed his head and took has hat off did miss otherwise he wouldn't be here today. One lucky dude, God must have been watching over him.
Seen a 308 do way worseQuote:
Originally Posted by Mohawk .308
Sent from my SM-G986B using Tapatalk
Yeah that video is terrifying. Cuts the ear off his muffs.Quote:
Originally Posted by Bol Tackshin
what happened ?Quote:
Originally Posted by BRADS
A couple of things too come outa this situation
YES PLEASE EVERYONE WEAR PROPER EYE PROTECTION ( & I mean at least specked polys ) when doing range - gong - sight in - practice.,
WTF is this guy shooting ? sorry for my ignorance but a "break open" 50bmg ( yes has a screw cap ) shooting some old army flame throwers just looks like an accident waiting to happen.
GOB BLESS lol
Would bet my 50bmg Noreen would not have failed like that.
Seams like a piss weak design.
Always have safety glasses on.
Sent from my iPhone using Tapatalk
I reckon the round was oiled inadvertently or charged with the wrong powder.Quote:
Originally Posted by akaroa1
There are thousands of screw breach artillery peices out there that worked just fine.
Aye, but were they not usually fitted with some sort of recoil dissipating system and positioned skywards, hence if it did vent out of the breech it would be directed downwards? (still a bad day though!)Quote:
Originally Posted by norsk
NoQuote:
Originally Posted by caberslash
Interupted thread breeches preceeded mechanical recoil dampning.
Interupted thread breeches have half the amount of bearing surface as a entirely threaded breech plug does.Breech plugs being introduced in the matchlock age continuing to today in modern reproduction muzzle loaders still using a threaded breech plug.
Where ever the the barrel is pointing makes no odds
If the breech lets go .
Interrupted thread typically has a much different (meatier) cross section profile, like the old rear-locking Remington bolts. What the maker seems to have used there is a standard triangular profile thread. It is basically the same as a pipe bomb end cap, and those are expected to let go... Also, as that end cap heats up, it’s expanding and less of the thread is meshing. It would still be doing up tight, but the meshing would be a lesser surface area progressively.
I think you'll find that story is permanently suppressedQuote:
Originally Posted by Mohawk .308
The word "detonation" springs to mind, a seriously dodgy "someone-elses-hand-load". With detonation, guns just don't hold up.
Interesting how the fail safe "ears" broke off and in the process the frame broke. As akaroa1 said, not a fail safe, seemingly there just to make sure the breech cap was fully screwed on.
I wonder if the gun would have failed more safely if tempered towards more toughness, less hardness/brittleness @gundoc?
Also, it would perhaps be desirable to deliberately weaken the front of the barrel hinge so that if things blow the barrel flies forwards on the receiver if that cap goes back. The safety "ears" might have a better chance to work then. Designing towards "safe failure" instead of pure faith in that screw lid seems in order -- the assumption being that "detonation WILL happen", eventually, to someone.
He called it a freak accident but I think he was playing Russian Roulette with his supply of dodgy ammo.
Also the manufacturer's claim that the piece was good for 85,000 psi seemed a bit light but have since found this data for proof testing a 50 BMG -
"Small arms proof testing
A small arms proof round is loaded to a higher than normal service pressure, stressing both the gun barrel and breech during firing. This can be due to a heavy projectile fired using the standard propelling charge, the standard projectile fired with a different propellant type or weight, or combinations of charge and bullet weight to give the required proofing pressure. Minimum proof testing pressures are specified by the owner of the cartridge specification, such as C.I.P. or SAAMI for most commercial cartridges or NATO EPVAT testing for appropriate military cartridges.
An example proofing round for the .50 BMG (12.7 × 99 mm) is the "cartridge, caliber .50, test, high pressure, M1". This uses the standard-weight .50 BMG M1 round propellant (240 gr of WC860), but a bullet weighing 999 gr (+/- 11 gr). The M1 proof round gives a proofing pressure of ~65,000 psi, 11,000 psi (~17%) above the standard service pressure."
So the manufacturers claim of 85,000 was well above proofing load of 65,000. So what the hell was the cartridge that he fired loaded with??
What actions are actually safe ? Are Martini style actions the safest ? Confirms to me that having a powerful cartridge loaded to starting loads is a lot better than trying to squeeze the last fps out of a lower powered round.
Nothing wrong with a "screw in lid" as millions of AR's in various sizes are evidence that a screw on barrel extension just plain works. There are many other examples of this approach and if one was to calculate the "locking area" of any thread compared with a normal bolt action you'd be surprised.
With respect, AR barrel extensions are not repeatedly done up and undone. They are also shouldered in front of the upper so they are really no comparison to this pipe bomb design.Quote:
Originally Posted by Tentman
Threaded breeches are not the same as a pipe bomb. False equivalence. What happened with this Serbu RN-50 is just what happens when you put a bomb inside a gun, any gun. I wonder if the shooter's ammo was sourced from some of the 'stores' Assad deliberately left unguarded for ISIL to raid. Plenty youtube videos made in Syria of exploding guns amid shouts of "allahu akhbar".Quote:
Originally Posted by ishoot10s
Greetings Moa Hunter and All,Quote:
Originally Posted by Moa Hunter
All firearm actions are safe when loaded within the pressure limits of the action including a substantial safety margin. We just need to work within it. I note from Zimmer's post above that the proof pressure for the 50 is about the same as the maximum pressure of many of the latest crop of cartridges. There are two things to note. A cartridge producing the same pressure but with a larger dia case produces more thrust to the action. Thus the thrust in a AR type barrel fixture is a great deal less than that delivered to the cap in the BMG. I would have run like hell if I had seen anyone loading a contraption like the one in question.
Regards Grandpamac.
Without seeing the action it is hard to determine the cause of the safety 'ear' failure but it would be reasonably safe to assume the gun was OK with normal proof loads (30% above normal pressure), especially with the screw breech which is strong system. I suspect the cartridge being loaded with the wrong powder by some careless handloader which probably took the pressure beyond 100,000 PSI. I have seen 90,000 PSI loads safely held by a Mk 5 Weatherby despite severe case head expansion. Pressure versus powder charge is a parabolic curve and a relatively small increase in charge can cause a large increase in pressure.
Greetings All,
I had a look at the Serbu Website and noted that the rifle in question sells for about $US1,300.00. Serbu also offer a single shot bolt action 50 calibre for twice that and a semi auto repeater for six times that. This leads me to the conclusion that the subject rifle is aimed at the lower end of the market which shows in function (desperately slow to load) and perhaps strength. It wouldn't be much use against the zombies, especially if you had to gather up all the parts and reassemble the rifle between shots.
Regards Grandpamac.
Being a Sabot round there might have been some sort of failure with the sabot part which caused the perpetrator to go haywire . Apparently the Marines tried to make these rounds in 7.62 and had to abandon them because of catastrophic problems of barrels exploding .
Hot load or not, that screw cap design gives me the shits for a 50 BMG rifle.
Yeah, at least when we made pipe bombs as kids we attached wire to the end caps so they didn't fly off too far or get lost.Quote:
Originally Posted by dogmatix
You raise a good point, foolish of these guys to take them on in a wide open area.Quote:
Originally Posted by Mauser308
https://www.youtube.com/watch?v=ZfgJuUMm-x0