I'm no expert for sure .. From what I'm understanding it could also be cause by having under the amount of powder required .... One would think it would be having to much powder ...
@@GalacticForceMedia important question! Was the brass case that was in the chamber when you pulled the trigger still in the chamber after the event???
Seeing how easy those bullets came out, I am absolutely convinced that what happened was the bullet was pushed back into the cartridge while it was being chambered causing an extreme over pressure situation.
Save the powder too! Measure 10 rounds and get an average. When you reuse it consider the average weight the absolute max charge. Drop back about 5% and start working up from there. .2 grains at a time. Look for pressure signs. Ejector marks, primer flow. Flattened primers. Your most likely culprit is the brass quality so I would measure the bullet and weigh it to ensure it is within spec, then use different brass.
Don't do it with the stock powder. The issue may be powder contamination. One other channel showed a close up of powder pulled from these rounds and it appears to be a ball powder contaminated with both extruded and flake style powder.
I only hammer-pull pistol rounds. I use a Hornaday collet bullet puller on everything else. It allows me to pour the powder load directly on my digital scale for load verification. You buy the puller then a collet for each caliber you need to pull. They are good for those rebated rim .458 SOCOM rounds that don't fit in a hammer-puller.
@@GalacticForceMedia that is what i load at with a 150 grain btsp hornady or speer with IMR3031 but 3031 isn't a real hot fast burning powder, i wonder what they used and what it did to the pressure.
I weighed the 470 rounds I had left of this lot and they all weighed exactly the same. I don’t know anything about reloading so not sure if this makes a difference or not. Thanks again for covering this.
Those bullets came out surprisingly easily with a couple weak taps in the puller. I wouldn’t be surprised if there are bullet setback issues caused by low neck tension. This is not uncommon with reloaders and results in overpressure rounds that rupture case heads causing KB’s. I’d recommend measuring OAL and testing how many pounds moves the projectile deeper into the case. I’m betting it won’t take much.
@Galactic Force Media grabbed them at a gun show because I've been shooting zsr 9mm for awhile and had no issues at all so I decided to try the 7.62s. i usually buy from true shot but these didn't come from there.
I’m going to mimic what some others have said, and was one of the possible issues I mentioned in a comment on one of your other videos… those bullet are coming out way too easy, improperly seated bullets will cause bullet setback. (It’s known to happen in revolvers, but it can happen in other firearms as well.) I have that exact tool and have pulled a lot of bullets using said tool, and compared to every bullet I have ever pulled, those bullet just get fell out. Most bullet I’ve pulled, I had to smash that thing on concrete 5 or more times. One thing I noticed is the failures seem to be happening in semi-auto 308 rifles and it’s always been one of the bullets near the bottom of the mag. Has there been a case of the failure in a bolt actions? If the issue is setback, it’s possible the bolt action doesn’t put as much stress on the bullets in the mag. Or it could be possible that bolt action rifles have smaller mags so you’re reloading before the catastrophic bullet setback can happen. (Does that make sense?).
Those bullets came out surprisingly easily with a couple weak taps in the kinetic puller. I wouldn’t be surprised if there are bullet setback issues caused by low case neck tension. (Bullet not held tight enough in the case mouth) This is not an uncommon with inexperienced reloaders and results in overpressure rounds that rupture case heads causing ‘Kabooms’. I’d recommend measuring cartridges’ OAL and testing how many pounds moves the projectile deeper into the case. I’m betting it won’t take much.
It's very obvious the issue with this ammo is the type, not the amount of powder that was used. It appears to me that some of the rds were loaded with fast burning IE pistol type rather than rifle (slower burning) powder. It would be about impossible to put enough rifle powder in the .308 case to cause these failures.
I think there’s a special bullet puller that you would screw into a reloading press to do them super quick. Maybe some viewer could donate if you were willing to go through the whole case you have and look for powder abnormalities
Improper factory neck tension caused your kaboom. When the round in question loaded, the bullet jumped from the case into the lands. Pulling the trigger then ignited a pipe bomb. To test my theory, count the number of hits it takes your kinetic bullet puller to pull a different manufacturer's ammo and you will see. My 308 reloads need 6 plus hits to pull the bullet. You could probably pull all the bullets, neck size the cases and reassemble the ammo and be good to go.
The video follow up to this shows that it was taking 2-3 hits on some rounds. However, Springfield reached out and gave me the final disposition on what happened after testing. That will be in a long overdue update video.
Need to measure how much powder is coming out of each case to check consistency & if some are overloaded. Also need to pay attention how much force it takes to remove the projectile. Is it a consistent two whacks? Are some two & others five or 10? Check the projectiles for signs they were over crimped which deforms the projectiles. Those are usually more difficult to remove (ie 5 whacks instead of two) Inspect the interior & exterior of the cases for signs of thin spots or stretching. Also check the fired cases for signs of excessive stretching near the head from being fired. I'm sure a missed something...
One of my buddies is going to give me his scale that he uses for reloads. I want to pull 2-3 rounds from each box and do a spot check. I would assume for that round it should be about 42(?) grains of powder, but I need to do a little more research.
thanks for doing this and posting. you need a scale , start measuring powder charges. and weigh the total round weight. chances are the powder was too fast in burn rate and or the charge was too much. dam turkish ammo.
With only two raps of the bullet puller, it appears the mouth was not adequately crimped into the bullet. Lightly crimped cases can cause high pressure two different ways. The bullet can be pushed deeper into the case on the chambering ramp, thus decreasing the case volume or even compressing the powder. Another problem can occur from recoil causing the bullet to move forward while it is in the mag. Repeated firings of the rounds above it might cause a lower round in the mag to have an overly protruding bullet which would jam tight against the rifling and cause excessively high pressure. The mag should stop the bullet from extending too far so deep seated bullets is my guess for the problems encountered. Look at the bullet after it is pulled and check for a crimp mark on it or check a live round to see if the mouth is crimped into the cannelure.
If you look at his previous video Another Report of a Gun EXPLODING at the Range. ZSR Ammo Was Used. at the 11:34 time there's no crimping on those rounds, the cannelures vary and the round next to the ruptured case is seated well below the cannelure which may have ruptured as well if fired. I've reloaded 1000's of 308 and those aren't right as far as amount of powder use, somewhere between 38-42 grains depending on powder and projectile weight for those wondering.
Like others are saying, you should try to get statistics on powder mass, bullet mass, bullet diameter, case length, and neck outer diameter before you pull the bullets. Weighing the powder will not tell you if the case is overloaded by itself, you need to know what the powder actually is to know that, but looking for non-uniformity in the powder charge would be interesting all by itself. The bullets were coming out pretty easily for factory loads, so it remains a possibility these high pressure events might have been caused by the bullet sliding out of the case upon the violent chambering of a semi-auto and touching the lands. This can produce higher pressures since the bullet has to overcome much higher static friction to get moving. If you have another semi-auto .308 gun you could try loading these rounds while manually cycling the action, but extracting the cartridges without firing them and then measuring the overall length (OAL) before and after to see if the bullet moves. An electronic or manual balance for weighing bullets and powder is not very expensive; any store that sells reloading supplies will have one or two models to choose from. A pair of calipers are also not very expensive.
Those bullets came out too easy. Not enough neck tension can cause bullet setback under recoil and the diminished case capacity increases pressure dramatically. My advice would be don’t disassemble any more until you can weigh powder AND check neck tension. One of those is the likely cause of the kaboom.
@@GalacticForceMedia That 17th bullet point slammed the front of the mag 16 times. Did the unfired rounds remaining (ie 18,19, and 20) show signs of setback into the case?
@@contemporaryprimitiveman3469 I did notice the 2 slams it took to have the bullet come out...I did not take into account the 17th round slamming the bullet enough to create set back in his case. Great dot-to-dot connection. It usually takes me about 4 whacks to get a bullet out after using Lee's Factory Crimp Die on 150 grain FMJ Hornady bullets with cannelure.
On every case of mine I have found a small indention, resembling an L near where your case split. It's on every round. It looks like bad tooling on in the loading process, or intentionally fouled brass. Check yours, you should see it as well. I can grab some pictures of mine if need be.
check the bullet diameters as well, some might be a thousandths oversized which is a lot more pressure then you would think for tiny difference. i don't know about if the overall round length will be an issue with them strait out of box but i'd recommend before pulling them check to see if all the rounds are crimped the same,some bullets might be poorly crimped in case and getting jammed into neck on feed? also if there is any brown vapors coming out of the powder after pulling that is a sign of degraded powder that is quite dangerous. I can't tell on video but check the powder grains themselves, might be some smaller granules in there. might be contaminated with pistol powder like a certain 50cal explosion. but without checking the weight of powder in each round and actually checking at least half of the ammo individually, you won't be able to guage if there are just some with more powder then they should have. I saw you said you were waiting on a scale, but actual wait on it and do full check. +/- one or two grains will not cause these types of problems. you are looking for ones on the outer deviations of weight. remember all powders are different density and burn rate, there is no 'one weight for each caliber'. and they are almost certainly not using civilian available powder so can't just go and check with a re-loader's chart for .308.
If you would like me to weigh charges I can do that for you. Located in Southern California, however. Just find someone in your area, or UPS ground me a couple 20 round boxes.
So there was something similar I had noticed with a previous lot of 9mm 124 grain. Granted it was not blowing up guns, but was showing similar issues like you were having with these rounds, bullets not seated, inconsistencies, etc. That being said, it was a different company, but the two companies I believe both share the same parent company and have had issues like this in the past, just not as catastrophic as blowing up a firearms, but the similarities are too strong for me to dismiss as a coincidence. I'll gladly email you correspondence with my friend who purchased the ammo on the matter if you are interested in our findings. It's just alot for a youtube comment. Luckily nobody was injured but my coworker even reached out to where he bought it noting safety concerns, not even looking for a refund, and he was basically dismissed as a non issue. Whereas, it is a big issue and obviously a safety issue and these companies are dismissing it.
Did weigh each cartridge see the variance in weights. That can quickly give you an idea which cartridge is overcharged with out having to deconstruct everything.
Why not get a cheap scale and measure powder to find out just HOW overcharged some of those rounds are? Film yourself doing it, You KNOW you'll find some to begin with.
i don"t know every thing but I've been reloading for a while. i would not use any part of that ammunition... it could have been bad a case.. bad or to much powder, wrong or bad primmer... and the list keeps going.... that was sad to watch because that is a gun on my list that I want.. More so, every one was ok at the end of the day... hope you get your gun replaced...
Im going with a out of time M1A gas system , with the amount of fire was expelled down the mag well , or a slam fire caused by the product you are useing , by the way , my super match spent more time flying back and forth to Illinois on UPS then I have on Delta , with no solvability in site , was issed a refund , bought a Polytech M14S , now the world is right , with my 1911 makeing 4 trips back and forth , never resolved. A measurement of powder would be a good thing. My owners manuel stated to use only XM80CL or. same , and nothin else , or warranty is void , so good luck to you in the future with that weapon.
A scale is like 10 bucks my friend, invest for the next video. Kinda pointless to watch. "Hur dur that's how much power is there, dunno if it's a lot or not". Cool to see that tool though, give ya a thumbs up for that lol.
