Stability programs ??

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  • Last Post 17 February 2011
Wayne S posted this 16 February 2011

http://castboolits.gunloads.com/showthread.php?t=102895&page=4>http://castboolits.gunloads.com/showthread.php?t=102895&page=4

these plus the Miller one and a few more I haven't found yet. IS there one that is more real life accurate that the others.

Specific, what twist for a barrel shooting 311299 <1.2 ” >  and 311365 <1.27” > at 1300-1400 fps 1-10, 1-11, 1-12 ?? Long story, Great Grand Daughters NROTC project

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CB posted this 16 February 2011

Greenhill says 11. If it was me I'd choose a 10.

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Wayne S posted this 16 February 2011

:doooah: The Jeff Miler one http://www.accurateshooter.com/index.php/topic,3755399.0.html>http://www.accurateshooter.com/index.php/topic,3755399.0.html

likes 1-11, as does  the 2nd. and 4th one

 the 1st one  and the 3rd one say 1-9.4

 I've got a 1-10 Contender Bbl. guess I'll make a SWAG on some 1300 FPS loads for my 200 gn. bullets  and try some at the range

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CB posted this 16 February 2011

Good idea

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cityboy posted this 16 February 2011

So very good articles on bullet stability have apppeared in Precision Shooting last year. i can't get my hands on them right now and tell you which issues.

Jim

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Wayne S posted this 16 February 2011

 Jim,

Thanks, I don't have access to P/S unless their articles are available on line. Their shooters  usually strive for the minimum full stability of their bullets, which is a good thing when it comes to cast bullets as well., thats why I'm thinking 1-11, but will do my testing with what's available ie; 1-10

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Ed Harris posted this 17 February 2011

Greenhill, despite its simplicity, gives useful results and works well.

But if you want to read more, here are the links:

http://www.jbmballistics.com/ballistics/bibliography/articles/miller_stability_1.pdf>http://www.jbmballistics.com/ballistics/bibliography/articles/millerstability1.pdf

http://www.jbmballistics.com/ballistics/bibliography/articles/miller_stability_2.pdf>http://www.jbmballistics.com/ballistics/bibliography/articles/millerstability2.pdf

73 de KE4SKY In Home Mix We Trust From the Home of Ed's Red in "Almost Heaven" West Virginia

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Wayne S posted this 17 February 2011

 Thank you,  wonder if Jeff  Miller is any kin to Don Miller :thinking:

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billwnr posted this 17 February 2011

10 inch twist is commonly used in the military rifle matches. 11 inch twist isn't all that common but some shooters are using it in the BR matches. 12 inch twist is a common twist rate for the BenchRest rifles and the 1.25 inch long bullets are shot by some.

You should join the CBA and you will be able to view all the match results. That may answer a lot of the twist rate and bullet stability questions.

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CB posted this 17 February 2011

You have to remember that the thread starter is wanting to shoot an inch and a quarter 30 cal. bullet at 13 to 1400 fps which is why I recommended and still recommend a 10 twist.

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billwnr posted this 17 February 2011

pat i. wrote: You have to remember that the thread starter is wanting to shoot an inch and a quarter 30 cal. bullet at 13 to 1400 fps which is why I recommended and still recommend a 10 twist. I was thinking of the military rifles when I read that as some of the bullets are between 1400-1500 fps for muzzle velocity.  Most of us cite the 16.0 grains of 2400 and a bullet of between 180-210 grains at 1500 fps where actual velocity is 1400 and some change.

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