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90,000 psi loads ?

 
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  #1  
Old 06-22-2010, 11:54 PM
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Join Date: Feb 2010
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90,000 psi loads ?

I noticed some weatherby loads dont have a saami/sammi pressure.and the weatherby action is proofed to 250,000 psi .might be why no one else chamber their calibers .any one care to share waht they know about high pressure calibers 70,000 psi+?.will the brass give out before the chamber ?
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  #2  
Old 06-23-2010, 04:30 PM
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Re: 90,000 psi loads ?

The steel yields at 100,000 or so, that would be the point where the gun locks up. It's only momentary though, so maybe it would survive?

I asked a question in another thread about the Weatherby having a freebore to drop the initial pressure peak.
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  #3  
Old 06-23-2010, 05:57 PM
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Re: 90,000 psi loads ?

Quote:
Originally Posted by GMBshootingclubM60 View Post
The steel yields at 100,000 or so, that would be the point where the gun locks up. It's only momentary though, so maybe it would survive?

I asked a question in another thread about the Weatherby having a freebore to drop the initial pressure peak.
They are SAAMI spec but with lots of free bore.

Brass will not take much more than 70,000 psi and last no mater what brand it is.

You are right about not shooting Weatherby ammo in a non free bored rifle, Even if it
is a Weatherby cartrige. The pressure will be to high and will probably blow the primers.

This is the way Weatherby gets the high velocity.(More powder with no more pressure)

Free bore does not hurt accuracy as long as the rifle is set up correctly. just like a belt.

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  #4  
Old 06-23-2010, 06:19 PM
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Re: 90,000 psi loads ?

What is meant by "the gun locks up. It's only momentary though"?
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  #5  
Old 06-23-2010, 09:46 PM
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Location: Blackfoot, Idaho
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Re: 90,000 psi loads ?

I have at least one shot @ greater than possibly 80,000. Had a bit of a powder bridging problem. Normal loads were running higher than 65,000 if the RSI was calibrated properly.

Hammered the bold open. Primer had a 64th or so space around it.

Went back to ball powder and never looked back.

The pressure hurt nothing but the case.
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  #6  
Old 06-23-2010, 10:14 PM
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Join Date: Jun 2010
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Re: 90,000 psi loads ?

Roy, did you magnaflux the bolt to see if there were any cracks at the base of the lugs? You may have a permanently weakened bolt?

Railroad couplers (knuckles) many times will show signs of a prior overstress when they break... at the same spot.
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  #7  
Old 06-23-2010, 10:16 PM
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Re: 90,000 psi loads ?

What's an RSI? Roy's stretch indicator? (smile)
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