SHOOTERS'
FORUM


FORUM MEMBERS: GO to http://forum.AccurateShooter.com/. Log in with SAME User Name and SAME Password.

THIS FORUM HAS MOVED!!
GO to Forum.AccurateShooter.com

THIS FORUM is NOT ACTIVE. POSTING and THREAD CREATION are halted.

You can read all posts on NEW FORUM: Forum.AccurateShooter.com

 
 |  Latest Topics
 
 
 


Reply
  Author   Comment  
farmview
Reply with quote  #1 
I'am not new. but not old ether.

I'am looking for twist rates info for 6mm & 243 barrels.

the twist are 1 in 8,8.5,9,9.25,9.5,10,12.......
What is the Lightest,Best & Heaves Bullet Grain weight
For each barrel twist rates?

please do not give BAD or incret information
Yellow11
Reply with quote  #2 
You need to establish the specific bullet length, weight and muzzle velocity (fps) and punch this into the Don Miller equation. You are looking for a gyroscopic stability factory in excess of 1.4.

Bryan Litz book contains all references you might need on this subject.
LWolken
Reply with quote  #3 
If your looking for a compromise, a 1-9" twist will shoot the 95 VLDs well and the lighter 55gr bullets. I shoot the 105 Amaxes in my 243 ack imp and they work well.

Lance
JamesinAsheville
Reply with quote  #4 
Here is one chart...
6mm/.243
- 8" Special for VLD bullets over 100 gr.
- 8"* Ratchet rifled 4 groove
- 10" For bullets up to 120 gr. and VLD under 100 gr.
- 12" for bullets up to 85gr.
- 13"* for bullets up to 75gr.
- 14"* for bullets up to 70gr.
- 14"* Ratchet rifled 4 groove
- 15"* Special for bullets up to 70gr.
RJinTexas
Reply with quote  #5 
I've owned more then one 9-1/4tw 27" factory 40x barrels chambered in 6mm Rem that shoot both 105gr and 55gr bullets equally well.

RJ
sleepygator
Reply with quote  #6 
My old 12" twist .244 Remington rifles were limited to lighter bullets, but the two newer 9" twist 6mm Remingtons are versatile. As RJ noted, they shoot everything from 105 A-Max and 95 VLD bullets to 55 grain Nosler BalTips. My 40-X with a Hart barrel shoots 58 grain Hornadys exceptionally well.

If you want to shoot 105 Berger VLD to 107 Sierra MK, you will need an 8" twist. IF you want to shoot the 115 Berger or DTAC, you will need a 7.8" or faster twist.
farmview
Reply with quote  #7 
So RJinTexas and sleepygator. 9-1/4" twist are the most versatile ove the 6mm&243 twist rates?
sleepygator
Reply with quote  #8 
As long as you do not want to shoot the heavy, long boattails like the Berger 105 and Sierra 107. Mine have a straight 9" twist. The heaviest that I can shoot is the Hornady 105 A-Max which seems a little easier to stabilize than others the same weight. It must be driven pretty hard.

If you do not care about the lightest (55 up to 70) bullets, go with the 8" so you can shoot the Sierra and Berger bullets. The light varmint bullets might have problems in 8" at .243 or 6mm velocities.
Previous Topic | Next Topic
Print
Reply

Quick Navigation:


Create your own forum with Website Toolbox!


You Can Help Support 6mmBR.com by Making a Small, Secure Donation.

Daily Shooter's Bulletin



Sponsored Searches Help Support this Forum