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Need some rifle twist experts to help me out...

 
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  #22  
Old 11-05-2013, 06:14 PM
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Re: Need some rifle twist experts to help me out...

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Originally Posted by Bodywerks View Post
Have you even looked at a stability factor calculator?
http://www.bergerbullets.com/litz/TwistRuleAlt.php
You really want 1.4 factor minimum. At 4000fps a 7.7 twist is fine. You'd probably get away with 8 twist, so long as 4,000 fps is your minimum. A bullet only gets more stable as it travels downrange, also, but you need that stability factor at the muzzle.
Most bullets will stabilize fine with an Sg of 1.1. For hunting applications you typically want a 1.4 or better.
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  #23  
Old 11-05-2013, 07:14 PM
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Re: Need some rifle twist experts to help me out...

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Originally Posted by MontanaRifleman View Post
The best thing for you to do is call the bullet maker to find the top end velocity of their offerings. Your other option is to call Dan at CEB and see what the heaviest highest BC bullet he can make you in a.224 7 twist. I'm guessing maybe an 80.

The barrel makers are sure gonna like you
Missed this. Any Idea what a minimum run might be? GS custom home page indicates they will make custom bullets.

Definitely want enough taper to set it back 2-3x.
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  #24  
Old 11-05-2013, 07:43 PM
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Re: Need some rifle twist experts to help me out...

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Originally Posted by HARPERC View Post
Missed this. Any Idea what a minimum run might be? GS custom home page indicates they will make custom bullets.

Definitely want enough taper to set it back 2-3x.
I'm guessing a min run would be 50, not sure. Best thing to do is call and find out
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  #25  
Old 11-05-2013, 08:08 PM
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Re: Need some rifle twist experts to help me out...

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Originally Posted by HARPERC View Post
Any Idea what a minimum run might be?
If it hasn't changed, it is 250. But that isn't for a totally new bullet. That is a tweak on an existing one.
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  #26  
Old 11-06-2013, 03:22 AM
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Re: Need some rifle twist experts to help me out...

Thanks!
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  #27  
Old 11-06-2013, 10:05 AM
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Re: Need some rifle twist experts to help me out...

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Originally Posted by Edd View Post
If it hasn't changed, it is 250. But that isn't for a totally new bullet. That is a tweak on an existing one.
They have a lot of longer higher BC prototypes on file that aren't listed on their site.
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  #28  
Old 01-05-2014, 08:08 AM
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Re: Need some rifle twist experts to help me out...

The minimum quantity for a totally new bullet is the quantity for one box. Could be 25, 50 or, for something smaller than .243 it would be 100. That applies only after we have established that the bullet is exactly what is required.

I need some basic information to get started but it usually does not take more than one or two prototypes to arrive at the solution needed. Prototypes do not cost anything apart from transport/postage. Bullet design is still done in South Africa and if we have a rifle available, initial testing is done in SA as well but manufacturing is now done in the USA
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