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PostPosted: Tue Nov 28, 2006 3:34 am 
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Knight of Daisies, Tulip Slayer
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Location: Sector ZZ9 Plural Z Alpha
This is from an email that was forwarded to me today. I have no idea who the original author was, nor which range this happened at.

Quote:
Today, Saturday 30 September, there was a non-injury mishap on the lower range. A customer, sighting-in his hunting rifle, forgot to remove the boresighter before firing a live round. It was a Savage bolt-action, I believe in 30-06. Attached are photos of the results. I'm sending this to newsletter director Laurits Dixon; Bill Anderson and other range officers present suggested I also send it to President Kadow, and while I had that page of the newsletter open I also decided to send it to the R/O director Bill Laughlin. I gave cards with my email address to some other R/Os and individuals who may also email me for copies. Bill Anderson asked the shooter if he might donate the remains of the barrel for hunter-safety courses. The rifle's action is probably salvageable and work on it may be done at Brightwater Ventures.

The boresighter was found almost all the way to the 100yd target holders.

Repeating, there were no injuries resulting from this incident. Lemme tell ya, I don't envy the R/O's jobs. I think I'll bring 'em a couple bottles of antacid tablets next time I visit!

<img width="320" height="240" src="http://www.httpcraft.org/images/boresight/DSCF0997a.jpg" />
<img width="320" height="240" src="http://www.httpcraft.org/images/boresight/DSCF0998a.jpg" />
<img width="320" height="240" src="http://www.httpcraft.org/images/boresight/DSCF1008a.jpg" />
<img width="320" height="240" src="http://www.httpcraft.org/images/boresight/DSCF0995a.jpg" />

(Right-click and View Image for much larger ones. Sorry I didn't resize them properly, I don't have proper image manipulation software on this box.)

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PostPosted: Tue Nov 28, 2006 11:26 pm 
That rates a 9.5 out of 10 on the old Holy-Shit-O-Meter.


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PostPosted: Wed Nov 29, 2006 12:31 am 
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Energizer Bunny
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Posts: 1634
...whoa. I didn't know that actually worked.

Vorn


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PostPosted: Wed Nov 29, 2006 3:38 pm 
Just goes to show you that Mythbusters is run by <b>utter morons</b>.


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PostPosted: Sun Mar 18, 2007 1:11 am 
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Knight of Daisies, Tulip Slayer
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Posts: 316
Dark_Tiger wrote:
Just goes to show you that Mythbusters is run by <b>utter morons</b>.


Huh?

I won't disagree with the sentiment, but I don't follow the comment.

(Note, if it's about splitting the barrel, older (i.e. lower grade steel) shotguns were sometimes shortened by shooting blanks into a barrel of water. The force would sheer off the barrel cleanly - more cleanly than a hacksaw. Doing this with modern shotguns will just hurt you )

BW

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PostPosted: Sun Mar 18, 2007 2:02 pm 
Bookworm wrote:
Dark_Tiger wrote:
Just goes to show you that Mythbusters is run by <b>utter morons</b>.


Huh?

I won't disagree with the sentiment, but I don't follow the comment.

(Note, if it's about splitting the barrel, older (i.e. lower grade steel) shotguns were sometimes shortened by shooting blanks into a barrel of water. The force would sheer off the barrel cleanly - more cleanly than a hacksaw. Doing this with modern shotguns will just hurt you )

BW

As I posted that, an ep where they "proved" that you couldn't get a gun barrel to explode was playing in the other room.


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PostPosted: Fri Mar 30, 2007 9:10 am 
Dark_Tiger wrote:
As I posted that, an ep where they "proved" that you couldn't get a gun barrel to explode was playing in the other room.

So, you believe one third party source but not another? Mythbusters had photos of a supposedly split barrel just like this picture, and tried everything they could to do the same. They could split the barrel but not "banana peel" it. I'm more inclined to believe their documented step-by-step failure, then I am a single photo showing a split barrel that could've been manually split or photoshopped.

However, I believe the ending of that episode put it down as "plausible" instead of "busted" because they conceded that rifle wear and flawed metal could play a large role in causing the result.


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PostPosted: Sat Mar 31, 2007 8:59 am 
One thing to remember is that there are a lot of different types of rifle barrels, and lots of different cartridges and loads. There are also different kinds of steels.

Older barrels tend to be of softer steel, which has a lower yield strength but actually a higher failure strength, meaning that a serious overpressure condition (like a plugged barrel) will balloon the steel out without splitting it wide open. Consider also that older rifles like this use lower-pressure cartridges. I suspect the boys on Mythbusters used an older rifle, if for no other reason than because it was a lot cheaper to do so.

Example: My 1891 Argentine Mauser has an old military barrel in 7x57mm, and because of the soft-steel barrel and old pre-98 action, I keep loads on the 30,000 psi range.

Newer rifles will not only be made of harder, less flexible steel, but will also fire much higher pressure cartridges. Also, manufacturers will often use slim profile barrels to keep weight down. The result is a rifle with a relatively lower failure strength, where the barrel may well split open or "banana peel" in a serious overpressure condition.

Example: My 1909 Brazilian Mauser has a Shilen heavy sporter barrel in .338 Win Mag, and since the heavy 98 action (an excellent pre-WW1 model from Deutsch-Waffen und Munitionsfabriken in Berlin) locks up like a bank vault, I regularly churn up 50,000 psi in loads.

Both rifles I mentioned would fail with a plugged barrel, but the '91 would likely balloon, while the '98 would probably split or banana-peel.

Mind you that the size of the cartridge is no indicator of chamber pressure. Loads for the .22-250 regularly churn up 50,000 psi or so, while the .45-70 is generally loaded to no more than 30,000 psi (although modern guns like my Marlin Guide Gun can handle much higher pressures, and I load my Bullwhacker to 45-50,000 psi, making it effectively a pocket .458 Mag.)

Shotguns present the bottom end of the scale. They generate about one-fourth of the chamber pressure of a modern centerfire rifle, and have very thin barrel walls. Shotgun failure tend to be isolated balloon or swells, very rarely do you see a complete failure.

In summary, there are no hard and fast rules as to barrel failure rates or conditions; they vary as widely as the range of rifles and loads. However, a newer, higher-pressure, thin-barreled rifle may well "banana-peel," while an older rifle with a heavier, softer barrel will just balloon.


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