Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Rifles, Bullets, Barrels and Ballistics


Reply

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

 
LinkBack Thread Tools Display Modes
  #8  
Old 11-04-2013, 07:00 PM
Platinum Member
 
Join Date: Aug 2003
Location: NC, oceanfront
Posts: 3,155
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.
Reply With Quote
  #9  
Old 11-04-2013, 07:42 PM
Platinum Member
 
Join Date: May 2008
Location: South of Canada and North of Wyoming
Posts: 5,954
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?
__________________
- Mark

You will never know how much it has cost my generation to preserve your freedom. I hope you make good use of it.
~ John Quincy Adams
Reply With Quote
  #10  
Old 11-04-2013, 08:28 PM
Platinum Member
 
Join Date: Dec 2011
Location: Michigan
Posts: 1,055
Re: Need some rifle twist experts to help me out...

Quote:
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!)
Reply With Quote
  #11  
Old 11-04-2013, 08:58 PM
Platinum Member
 
Join Date: Oct 2008
Location: Alabama
Posts: 5,368
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...
__________________
"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.
Reply With Quote
  #12  
Old 11-04-2013, 09:00 PM
Platinum Member
 
Join Date: Oct 2008
Location: Alabama
Posts: 5,368
Re: Need some rifle twist experts to help me out...

Quote:
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?
__________________
"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.
Reply With Quote
  #13  
Old 11-05-2013, 06:40 AM
Platinum Member
 
Join Date: Aug 2003
Location: NC, oceanfront
Posts: 3,155
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.
Reply With Quote
  #14  
Old 11-05-2013, 09:44 AM
Platinum Member
 
Join Date: Oct 2008
Location: Alabama
Posts: 5,368
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?
__________________
"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.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Current Poll
Are you on Facebook?
Yes - 46.62%
1,091 Vote
No - 19.19%
449 Votes
No, but I may join - 1.75%
41 Votes
No way, are you kidding? - 36.15%
846 Votes
Total Votes: 2,340
You may not vote on this poll.

All times are GMT -5. The time now is 01:25 AM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC