Long Range Hunting Online Magazine


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

Rifles, Bullets, Barrels & Ballistics Applied Ballistics


Reply

Barrel twist

 
LinkBack Thread Tools Display Modes
  #1  
Old 05-18-2002, 06:05 PM
Taz Taz is offline
Junior Member
 
Join Date: Jan 2002
Posts: 10
Barrel twist

Hey ya'll!

I need some info on barrel twists for 30 cal. JLK 190 & 210. I know the 10 twist is norm, but would the 11 twist be better? [img]images/icons/confused.gif[/img]
Reply With Quote
  #2  
Old 05-18-2002, 08:05 PM
 
Posts: n/a
Re: Barrel twist

Taz--
What cartridge /velocity are you using? CJ
Reply With Quote
  #3  
Old 05-18-2002, 09:41 PM
Taz Taz is offline
Junior Member
 
Join Date: Jan 2002
Posts: 10
Re: Barrel twist

I am using the 300 wsm. Velocity - I'm guessing 2950 to 3050.
Reply With Quote
  #4  
Old 05-19-2002, 08:40 AM
 
Posts: n/a
Re: Barrel twist

Taz -- I forgot to ask the bullet length, so try this formula--
(180 x bullet dia x bullet dia)/ bullet length = rate of spin. If your velocity is below 2800 fps, use 150 instead of 180 as your constant. CJ
Reply With Quote
  #5  
Old 05-19-2002, 10:29 AM
Silver Member
 
Join Date: Mar 2002
Location: McNeal, AZ
Posts: 368
Re: Barrel twist

Chris,

What formula do you use to determine your first number ( 180 or 150 ) versus Velocity?

I was thinking that with the formula you gave, I might be able to reverse it when working up new loads. With a known twist, it might help me look for a specific window of velocity for best bullet performance. But I can't find how your beginning numbers relate to the bullets speed.
__________________
If I can kill that coyote from here, Will you walk out to get him?
Reply With Quote
  #6  
Old 05-19-2002, 10:40 AM
 
Posts: n/a
Re: Barrel twist

Tim-- Good Question-- I pulled it off of one of the ballistics sites and I don't remember which one. I'll try to find it and get back to you. I don't remember seeing the formula, just the numbers given as constants. I'll try to look it up tonight. Chris
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: Barrel twist
Thread Thread Starter Forum Replies Last Post
6mm re-barrel brand,length and barrel twist mcseal2 Rifles, Bullets, Barrels & Ballistics 12 11-07-2010 08:14 PM
300 rum barrel twist qqqq33 Rifles, Bullets, Barrels & Ballistics 1 04-02-2009 10:36 AM
which break, barrel length, barrel cotour, and twist? nathank Rifles, Bullets, Barrels & Ballistics 1 02-03-2009 08:31 PM
Barrel Twist Gandolf1 Rifles, Bullets, Barrels & Ballistics 12 08-27-2005 05:45 AM
barrel twist xander Rifles, Bullets, Barrels & Ballistics 3 09-18-2004 07:50 PM


All times are GMT -5. The time now is 03:25 PM.


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