Recent Blow-up of a Sako 85

pathfinder76 said:
Works great actually. Tested pistol powder charges Saturday. Will form the rest today.

T8ofZaM.jpg
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308 Norma will also work after reforming and shortening to 338 specs. :)

Ted
 
This keeps happening? Really? Please show us the plentiful examples of Sako 85’s that this has happened to, Chunk?
When it comes to ignoring facts, you certainly do.
Enquiring minds, and all that?
Not the most common? Tens of thousands of production rifles, aren’t that common?
Keep trolling…
Weird.
R.
 
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This whole thread is very comical. Nothing but rumours, hearsay, innuendo. With a bit of distraction thrown in for good measure lol.
It deserves the one star rating...
 
BattleRife said:
ALF has clearly got his degradation mechanisms confused in his head. He seems to be taking ammonia stress-corrosion cracking of brass and extrapolating it to steel. This does not happen. High-strength steels can suffer cracking due to exposure to strong (stronger than ammonia) caustics, and corrosion in acids can cause hydrogen charging that leads to hydrogen-induced cracking, but ammonia will not cause SCC in steel.





Well now that is interesting. But your statement about the steel needing to be free of inclusions is not practical.

Stainless barrels and actions are almost always made of 416 alloy, which is a modification of 410 stainless to provide improved machinability. The modification is additions of manganese and sulphur, to intentionally create MnS inclusions. These inclusions form into elongated shapes called stringers. The stringers are brittle and act as chip breakers when the material is machined, so that you don't get the long stringy cuttings that foul the cutting tool, leading to all sorts of vibrations and poor finish.

So the inclusions are intentional and are required to enhance machinability. If you remove them you are just back to 410 stainless. The manufacturers of 416 just have to be careful to not get too many stringers, or stringers that are too large, to avoid weak spot in barrel walls.

Two fun facts: The bursting of AR10 serial 1002 in testing at Aberdeen Proving Grounds in 1956 was caused by a 416 barrel that had excessively wide stringers in it, creating a weak point in the barrel. And, this is why you don't commonly see stainless shotgun barrels. The barrels of a shotgun are so thin, using a machineable grade of stainless the risk of the stringers compromising the barrel would be too high.
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Nice to see a proper answer to the Sako blow-up question. :cool:
 
Janeau said:
That reminds me of that video the guy blew up his rifle..he forgot a cleaning rod in the muzzle..thats some time ago..
Op..this is a useless post without proper references..it might have been all made up as far as reading your post..
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This thread is so far off topic I will add an experience I had several years ago (2007) with a customer who brought me his rifle to check over...


Cleaning rod at 2700 f/s

I just examined a Remington 30-06 Model 760. There appears to be no damage and the headspace is correct.

The customer brought it in after he had a bit of an accident with it. Two of them were going to clean the barrel...

While standing the butt of the rifle on a chair, one of them pushed a cleaning rod down the barrel until it stopped... the action was closed... he reached around intending the use the action release and open the action, accidentally depressed the trigger,,, and BOOM the rifle fired. There had been a live round in the chamber. I was stunned as he told me this.

I asked if anyone was hurt... he said his brother had burnt his thumb and a finger a bit as he had them on the cleaning rod...

I asked what happened to the rod... he said it went through the ceiling.

I asked what about the roof... he said he didn't have a ladder and he has not been up in the attic. I assume the rod probably is up there, and who knows where the bullet ended up...

Two lucky guys to get away with such little damage in such circumstances. Can you imagine holding on to a cleaning rod at that velocity and having a bullet pass between your fingers as well.... !!!
 
SHELL SHUCKER said:
Nice to see a proper answer to the Sako blow-up question. :cool:
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Not overly. It, like this inane post itself, is beating a very dead, and very unrelated horse. The cause of the 2004/5 barrel failures was acknowledged by sako, to much sulfur, intended to ease machining. That would seem to have absolutely nothing to do with the failure at the center of this thread.
 
This wonderfully 'unwoke' quote from another site, often fits the bill.

"Arguing on these forums is like running in the Special Olympics... even if you win you are still retarded"
 
Quote Originally Posted by ytlogger View Post
"Arguing on these forums is like running in the Special Olympics... even if you win you are still retarded"

Good grief!! Hard to find a more heartless and despicable comment than that.

Yes ! What a RETARDED thing to SAY ytlogger ! :mad: RJ
 
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BattleRife said:
ALF has clearly got his degradation mechanisms confused in his head. He seems to be taking ammonia stress-corrosion cracking of brass and extrapolating it to steel. This does not happen. High-strength steels can suffer cracking due to exposure to strong (stronger than ammonia) caustics, and corrosion in acids can cause hydrogen charging that leads to hydrogen-induced cracking, but ammonia will not cause SCC in steel.





Well now that is interesting. But your statement about the steel needing to be free of inclusions is not practical.

Stainless barrels and actions are almost always made of 416 alloy, which is a modification of 410 stainless to provide improved machinability. The modification is additions of manganese and sulphur, to intentionally create MnS inclusions. These inclusions form into elongated shapes called stringers. The stringers are brittle and act as chip breakers when the material is machined, so that you don't get the long stringy cuttings that foul the cutting tool, leading to all sorts of vibrations and poor finish.

So the inclusions are intentional and are required to enhance machinability. If you remove them you are just back to 410 stainless. The manufacturers of 416 just have to be careful to not get too many stringers, or stringers that are too large, to avoid weak spot in barrel walls.

Two fun facts: The bursting of AR10 serial 1002 in testing at Aberdeen Proving Grounds in 1956 was caused by a 416 barrel that had excessively wide stringers in it, creating a weak point in the barrel. And, this is why you don't commonly see stainless shotgun barrels. The barrels of a shotgun are so thin, using a machineable grade of stainless the risk of the stringers compromising the barrel would be too high.
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The BARREL never blew up in the picture ! SO ?? RJ
 
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