Modern Sporting Rifle Evolution
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BACON101

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Reply with quote  #1 
Hello, I put together a Wolverine a few months ago and so far I’ve only used two boxes of JBs loaded ammo 100gr accubonds . And sometimes the bolt locks back up on the last round sometimes it doesn’t. Today I had one case stuck in the chamber. I couldn’t pull it out by hand, I even hit the buttstock on the ground while pulling charging handle and I broke off a piece of the case were the extractor catches it. I had to tap it out with cleaning rod. The primer look effed up lol What could be the cause of this? I haven’t had a chance to reload for it.

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RangerJoe

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Reply with quote  #2 
Man - that is a bummer.  In simplest terms, a stuck case is a result of excess friction between the cartridge casing and the chamber wall.  That excess friction can be one thing, or multiple things combined.  For example (not implying _any_ of these are true in your situation): a rough chamber, a severely fouled chamber, debris in the chamber, corroded brass, weak or faulty brass, over pressure load, excess cartridge headspace, plus a few other not-so-common contributors.  Remember - problems are additive.

I don't see any obvious marks on the brass to indicate a rough or fouled chamber.  Do you know how to measure the cartridge headspace difference between your FIRED brass and the unfired stuff?  The absolute numbers do not matter here, only the difference between LOADED and FIRED.  This can tell us if excess cartridge could be an issue.

Another possibility is that piece of brass was weak and it expanded excessively. This can happen with factory new brass or reloads. With military brass, some percentage of the once-fired 5.56x45mm GI cases on the market was fired out of M249 Squad Automatic Weapons (SAW); and some percentage of SAWs (especially from larger Training Posts) have chambers eroded and worn so bad, you could damn near load a 6.8SPC into them.  Cases fired in those chambers are really stretched (and therefore thinned); even when resized back down to correct external dimensions, the structural integrity of the brass is compromised.  In these situations, a stuck case is a good result... a case head separation is a more ugly and too common result.

I can't really see what the mark is on the primer.  It looks to me like a sliver of metal was on the both face and left that crescent-shaped impression; maybe a sliver of primer metal, brass, or bullet jacket shaved off from a prior round.

PS: Likely not necessary to say - but DO NOT reload that stuck case.

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BACON101

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Reply with quote  #3 
I have the Hornady headspace kit. Do you know which one to use? I don’t think I have any new unfired rounds, I was running a can on it if it makes a difference. And no defently pulling that case trash lol.the rifle was cleaned prior to shooting. I’ve only ran 20 the first time and cleaned afterwards. That was like the 5th round I fired. The bolt face looks good still.
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BACON101

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Reply with quote  #4 
Lmao the funny thing.... I was showing the rifle/ 277 wlv to a buddy of mine that was intrested in it hahahaha. But I think he liked it. I don’t know if anyone else with a 277 wlv near me (Houston area) . Thanks ranger joe for replying! 😁
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MDWS

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Reply with quote  #5 
What's interesting is all the other rounds fired ok it sounds like, but this one had the issue, and the obvious difference between it and the others is the lateral impression on the primer.  Is it possible you had debris on the bolt head when this round fired jamming it up in the chamber?

Like Joe said I don't see any obvious issue with the case body, shoulder, neck or mouth in the pics you posted.

Are you able to hand-cycle rounds without issue?
If this was the 5th round fired, but you have 20 fired rounds shown in the box, can you confirm the first 4 shot fine and so did the last 15?  
What are the barrel and build specs?

Sorry to hear it had an issue, but it'll get figured out I'm sure.

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Dvalin

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Reply with quote  #6 
How's the ejection pattern?

My best guess is, that the gun was slightly overgassed, then being suppressed overgassed more, causing early extraction at too high of a chamber pressure. It looks like that left a piece of a previous rim on the bolt face, causing a headspace issue and more pressure, hence the stuck case and the primer damage.

Or.........I'm comepletely full of S$#*!
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MDWS

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Reply with quote  #7 
Quote:
Originally Posted by Dvalin
How's the ejection pattern?

My best guess is, that the gun was slightly overgassed, then being suppressed overgassed more, causing early extraction at too high of a chamber pressure. It looks like that left a piece of a previous rim on the bolt face, causing a headspace issue and more pressure, hence the stuck case and the primer damage.

Or.........I'm comepletely full of S$#*!


Solid theory on the rim piece and others. 

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daheat

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Reply with quote  #8 
Early on I had the same issue with some ammo I had bought from one of the vendors that used to sell here. every case would stick and had to be knocked out with a rod, didn't whether they were fired or not. After I pulled a couple of the bullets and measure the case I found them to be between 8 &  10 thousands long. after pulling the bullet and trimming to proper length I haven't had an issue since. Could be that one got through without being trimmed. Might be worth a measure. Stuff happens!   
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RangerJoe

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Reply with quote  #9 
I have nearly 50 years worth of "Lesson Cartridges" in my shop.  Cartridges fired in the wrong chamber, splits, head separations, debris in the chamber, no flash hole, torn off rims, two bullets in one case, double charge, etc.  Thank God - none of these lessons were mine; I prefer to learn from others' mistakes.  Someone "lifted" my collection of blown revolver cylinders, back straps, bolts, rifle receivers, etc, on a previous military PCS.

A sliver of metal (e.g., case rim, primer shaving, bullet jacket, etc.) is a likely cause for the crescent indent on the primer (best I can tell).  Whether that would cause the stuck case is interesting; but since they both happened on the same firing... there may be a correlation.   

Firing with a suppressor changes the equation (not mentioned in original post).  That causes a LOT more pressure at the gas port, which causes more violent, and possibly earlier, extraction action.  Suppressors also delay the release of pressure from the case against the chamber walls.  Remember I said that all ingredients are "additive".  If this piece of brass was a tad weak, if the cartridge headspace a tad short, or a piece of debris jammed the brass, or ..... - the extra pressure from the suppressor only made the situation worse.

I still feel it is wise to check cartridge headspace - but if you don't have any loaded ammo left (especially from the same batch) - then it is a moot point.  Hornady Insert "A" is the one to use for the .277 WLV.

As DAHEAT commented, yet another possible cause of over-pressure is a cartridge case too long.  That causes the brass's neck to get crammed into the lead/throat area of the barrel... increasing pressure to potentially dangerous levels.  REMEMBER... ALL these ingredients are additive.  Throw a suppressor into the mix and increase gas pressure even more.

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BACON101

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Reply with quote  #10 
Mdws - yes that was the only one that had an issue all the others ran flawlessly and consistently ejected at the 4’oclock area. Yea I guess I could of had some debris i wasn’t aware of in the boltface.
Dvalin-consistently on the 4’oclock and It makes sense that the previous round could of left an invention on the primer .

Daheat- I will check the case lengths in the morning, I’ve heard of that issue on boltactions.

Ranger joe- thanks again! Oops I forgot to mention the suppressor lol.
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BACON101

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Reply with quote  #11 
Mdws it’s one of your 18 premium heavy barrels, BCM KMR 13”hand guard with bcm gas block dead air muzzle brake, aero upper with faceted boltcarrier group that you sell.
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RangerJoe

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Reply with quote  #12 
Bacon101 - any updates?  Cartridge headspace?
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