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

 
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  #15  
Old 11-05-2013, 10:10 AM
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Re: Need some rifle twist experts to help me out...

Mud, what is your application... hunting? Target shooting?
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Old 11-05-2013, 03:43 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
Mud, what is your application... hunting? Target shooting?
Initially, load development and targets while getting the wildcat tamed...And loads developed.

Then LR coyote & varmint hunting (750-1000 yards)...Maybe even LR whitetail deer.

With that bullet, and traveling 4200 fps, it shows my drop out to 1000 (with a 100 yard zero) will be 125.92" (just a hair shy of 13 MOA)...And it will still be retaining 2,329.6 fps velocity, and 1,084.4 ft. lbs of energy...Which will be more than alot of LR calibers with much larger bullets (such as .308 Win, etc...), so it might even be a very viable option for LR hunting large or fast animals such as deer, antelope, or anything of that nature...

If I can only reach 4,000 fps, it will still only drop 143.20", will retain 2,158.8 fps velocity, and 931.2 ft. lbs of energy...Which is still damn-impressive for a .224 caliber bullet.
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Old 11-05-2013, 04:47 PM
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Re: Need some rifle twist experts to help me out...

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.
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  #18  
Old 11-05-2013, 04:49 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.
Yes, I have used those plenty of times before...

How do they get more stable downrange? Most bullets will reach a point where they loose so much velocity they begin to tumble...
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"I'm just a peckerwood who lives in the hills with too many guns..." - Bob Lee Swagger

"Give me a minute...I'm good. Give me an hour...I'm great. Give me 6 months...And I'm unbeatable." - Col. Hannibal Smith

Ignore everything I say, because I have a reading comprehension and memory problem...

Quote:
Originally Posted by WildRose View Post
The 284 is to the STW what a tricycle is to a Ninja.
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  #19  
Old 11-05-2013, 04:52 PM
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Re: Need some rifle twist experts to help me out...

Unfortunately you won't be able to get those bullets close to 4000 fps before they come apart. Best chance at getting a thin skinned bullet out of a tight twist at high velocity is with a 5R gain twist bore. 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
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  #20  
Old 11-05-2013, 05:22 PM
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Re: Need some rifle twist experts to help me out...

Again no experience just an interested observer. My "guess" is a heavy/long .224 bullet, driven to 4000fps +, in a 1:7" twist barrel, will need to be monometal of some sort to keep the back end from catching up to the front end, and have minimal bearing surface..

There are some threads from Kirby Allen's efforts with .224 heavyweights that are good reads.

The TTH site has some good discussions about the subject.

Ken Clark did get Hornady to make a run of bullets, but mostly he made his own bullets. I think to be successful, making the bullets yourself will still be required.
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  #21  
Old 11-05-2013, 05:32 PM
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Re: Need some rifle twist experts to help me out...

Quote:
Originally Posted by MudRunner2005 View Post
Yes, I have used those plenty of times before...

How do they get more stable downrange? Most bullets will reach a point where they loose so much velocity they begin to tumble...
I'm speaking of spin stability only. Dynamic stability is a different animal
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