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Weatherby Free Bore?

 
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  #1  
Old 12-29-2009, 04:54 PM
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Weatherby Free Bore?

Can someone explain to me why weatherbys have a free bore. And why they still use it?
Thanks
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  #2  
Old 12-29-2009, 05:07 PM
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Re: Weatherby Free Bore?

It is dome on the Weatherby Mag rounds to keep pressure down. The overbore cartridges like most Weatherbys have it and so does Remington Ulta Mags. A Weatherby rifle in a non-weatherby round like my 22-250 SVM does not have it.

Jeff
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Old 12-29-2009, 05:20 PM
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Re: Weatherby Free Bore?

So all overbore cartridges have it? Like 7mm stw, .338 edge, etc...
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Old 12-29-2009, 05:31 PM
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Re: Weatherby Free Bore?

Quote:
Originally Posted by ovastafford View Post
So all overbore cartridges have it? Like 7mm stw, .338 edge, etc...

No, it is mostly used for factory rifles Like Weatherby's and Rem Ultra's. In custom rifles it would be up to the smith building the rifle wether he chose to set his reamer up with it or not and how much.

Jeff
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Old 12-29-2009, 05:44 PM
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Re: Weatherby Free Bore?

Okay I get it. Thanks for the help.
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  #6  
Old 12-30-2009, 12:15 AM
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Re: Weatherby Free Bore?

Freeboring is a way to get higher muzzle velocity with the same chamber pressure. It slams the bullet harder into the rifling and typically ain't as accurate as standard throats which are shorter. Bullets are less deformed when more gently pushed into the rifling

Roy Weatherby knew this but it didn't matter. At the ranges his cartridges were used at, a slight degradation in accuracy was an acceptable compromise to get the higher muzzle velocity he wanted.
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Old 12-31-2009, 03:41 PM
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Re: Weatherby Free Bore?

Quote:
Originally Posted by Bart B View Post
Freeboring is a way to get higher muzzle velocity with the same chamber pressure. It slams the bullet harder into the rifling and typically ain't as accurate as standard throats which are shorter. Bullets are less deformed when more gently pushed into the rifling

Roy Weatherby knew this but it didn't matter. At the ranges his cartridges were used at, a slight degradation in accuracy was an acceptable compromise to get the higher muzzle velocity he wanted.
Not to be argumentative, but:
I'm not sure that you get higher velocity with the same chamber pressure?? Isn't it more being able to increase the powder charge because of the increased volume thereby increasing velocity?
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