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The Nightstar Zoo • View topic - Remember to remove the boresight!

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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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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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...whoa. I didn't know that actually worked.

Vorn


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PostPosted: Wed Nov 29, 2006 3:38 pm 


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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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I'll get a life when it is proven and substantiated to be better than what I am currently experiencing.


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PostPosted: Sun Mar 18, 2007 2:02 pm 


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PostPosted: Fri Mar 30, 2007 9:10 am 


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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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