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Berger 338!!!

 
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  #8  
Old 11-10-2008, 12:13 PM
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Re: Berger 338!!!

Quote:
Originally Posted by Kalashnikov View Post
Any idea what barrel twist will handle them or what Berger recommends ?

I'm bettin' a 10 twist will do it.

If not I'll just put a pipe wrench on the muzzle and increase it a bit.
Oh crap, then the brake would need re-indexed.:(
Ah Ha! a filed to fit washer could do the job. Whoo Hooo
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  #9  
Old 11-10-2008, 11:06 PM
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Re: Berger 338!!!

I got an e-mail response from Eric @ Berger just yesterday, that 1:10 twist will work fine at 3200fps with the 300gr.
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  #10  
Old 11-11-2008, 01:34 PM
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Re: Berger 338!!!

Hello 7mmrowland
I did get this answer from Eric 28 sept.2008 ;


Hello Torbjorn,

Please excuse my delay in responding to you email. The 338 cal machine is progressing but we are not close yet. 6 more months maybe.

Me to waiting ;)
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  #11  
Old 11-11-2008, 03:51 PM
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Re: Berger 338!!!

trueblue,

Any indication if 10 twist will work for the 300g at 3K and below? Most of us won't be pushing it at 3200K, of course. I'm hoping that Berger would make the 300 work at lower velocities in a 10 twist.
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  #12  
Old 11-11-2008, 04:25 PM
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Re: Berger 338!!!

jmden,

Eric stated that the 338 cal would be designed around a 10 twist barrel. I did not save the e-mail, so I am going by memory.
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  #13  
Old 11-11-2008, 04:33 PM
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Re: Berger 338!!!

If in fact that is the case a 9.4 won't stabilize them under 3000 fps. Something sounds funny as there are only a fist full of rounds capable of this with a 300 grain bullet.
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  #14  
Old 11-11-2008, 07:19 PM
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Re: Berger 338!!!

All of the Berger .338 bullets are designed to be stable in a 1:10" twist, at any reasonable speed (anything over 2200 fps muzzle velocity).

Another thread on this forum was asking about the BC of the Berger .338's. I've copied my reply here since some of the same questions were being asked, and you guys might find it useful:

I'll stick my neck out there and make an estimate.

These numbers are based on the dimensions of the bullets, and a database of information I've compiled that relates measured (tested) BC to bullet geometry. This method results in estimates that are typically within +/- 3% of the measured BC.

The BC's are average from 3000 to 1500 fps.

300 grain Tangent (non-VLD) ogive:
estimated G1 BC: 0.749 lb/in^2
estimated G7 BC: 0.384 lb/in^2

300 grain Secant (VLD) ogive:
estimated G1 BC: 0.855 lb/in^2
estimated G7 BC: 0.438 lb/in^2

For best results when doing trajectory calculations for these bullets, use the G7 BC if your program allows.

I'm very curious to test these bullets and see how accurate the estimates are.

-Bryan
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