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

 
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  #8  
Old 11-04-2013, 07:00 PM
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Re: Need some rifle twist experts to help me out...

Quote:
Originally Posted by MudRunner2005 View Post
So, a 5R rifled 7.7 twist Bartlein 26" Rem Varmint contour is about my only option available right now.
Would that barrel stablize a 90 VLD at 4,000-4,200 fps?
It would blow up a little over 3300fps at that twist.
If not for this, it would still be only marginally stable under ICAO conditions.

It's because of a sharp balance in twist to failure, that the 90VLD is less useful than lighter bullets.
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  #9  
Old 11-04-2013, 07:42 PM
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Re: Need some rifle twist experts to help me out...

What overbore barrel burning cartridge are you going to drive 90 gr .224 bullets to 4000 fps and what powder are you going to use?
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  #10  
Old 11-04-2013, 08:28 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
What overbore barrel burning cartridge are you going to drive 90 gr .224 bullets to 4000 fps and what powder are you going to use?

I am curious as well, and am tagging along. 223-EDGE?

Awesome, I want to hear more about it (and if it works!)
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  #11  
Old 11-04-2013, 08:58 PM
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Re: Need some rifle twist experts to help me out...

It's a project of mine called the .22 Evidentem...And it will be 7828 SSC powder.

I haven't had the reamer or dies made yet, but I will hopefully soon...
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The 284 is to the STW what a tricycle is to a Ninja.
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  #12  
Old 11-04-2013, 09:00 PM
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Re: Need some rifle twist experts to help me out...

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Originally Posted by Mikecr View Post
It would blow up a little over 3300fps at that twist.
If not for this, it would still be only marginally stable under ICAO conditions.

It's because of a sharp balance in twist to failure, that the 90VLD is less useful than lighter bullets.
That's what I was thinking...Ultra tight twist and alot of speed = kaboom!

So, would a 12" twist work better on that bullet as fast as it will be traveling?
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"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

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Quote:
Originally Posted by WildRose View Post
The 284 is to the STW what a tricycle is to a Ninja.
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  #13  
Old 11-05-2013, 06:40 AM
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Re: Need some rifle twist experts to help me out...

No, you have misunderstandings of stability.
It's not purely about RPMs. It's about displacement as an overturning force -that revolutions of a bullet resist (gyroscopically).
For that bullet you need 1 turn per 7" of displacement, regardless of velocity.
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  #14  
Old 11-05-2013, 09:44 AM
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Re: Need some rifle twist experts to help me out...

Quote:
Originally Posted by Mikecr View Post
No, you have misunderstandings of stability.
It's not purely about RPMs. It's about displacement as an overturning force -that revolutions of a bullet resist (gyroscopically).
For that bullet you need 1 turn per 7" of displacement, regardless of velocity.
Gotcha! Ok, that makes more sense now. Thanks for the info.

So regardless of velocity, I will need a 7 twist for that bullet. Period.

However, that bullet at that velocity might explode as it leaves the muzzle because it can't handle spinning at that many RPM's...

Correct?
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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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