Previous Thread
Next Thread
Print Thread
#11984266 - 04/19/17 Twist rate of a 264 win in Remington SS CDL ?  
Joined: May 2005
Posts: 825
Cntrmass Offline
Campfire Regular
Cntrmass  Offline
Campfire Regular

Joined: May 2005
Posts: 825
Big Sky Country
Anyone?

CMG 300 BP
#11984560 - 04/20/17 Re: Twist rate of a 264 win in Remington SS CDL ? [Re: Cntrmass]  
Joined: Sep 2007
Posts: 2,930
gerry35 Offline
Campfire Guide
gerry35  Offline
Campfire Guide

Joined: Sep 2007
Posts: 2,930
B.C.
I thought they were a 1 in 9 like the Model 70 Winchester's


Gerry.
#11985435 - 04/20/17 Re: Twist rate of a 264 win in Remington SS CDL ? [Re: Cntrmass]  
Joined: Apr 2011
Posts: 11,261
hanco Offline
Campfire 'Bwana
hanco  Offline
Campfire 'Bwana

Joined: Apr 2011
Posts: 11,261
Texas
1 in 9

#11985663 - 04/20/17 Re: Twist rate of a 264 win in Remington SS CDL ? [Re: Cntrmass]  
Joined: May 2005
Posts: 825
Cntrmass Offline
Campfire Regular
Cntrmass  Offline
Campfire Regular

Joined: May 2005
Posts: 825
Big Sky Country
Thank you

#11985983 - 04/20/17 Re: Twist rate of a 264 win in Remington SS CDL ? [Re: Cntrmass]  
Joined: Nov 2009
Posts: 407
BruinPoint Offline
Campfire Regular
BruinPoint  Offline
Campfire Regular

Joined: Nov 2009
Posts: 407
Western Colorado
Yup, 1 in 9. My CDL .264 barrel is a tomato stake now... Keep thinking about having one built but it will be 1:8.

#11985994 - 04/20/17 Re: Twist rate of a 264 win in Remington SS CDL ? [Re: BruinPoint]  
Joined: Jul 2001
Posts: 42,510
Mule Deer Offline
Campfire Oracle
Mule Deer  Offline
Campfire Oracle

Joined: Jul 2001
Posts: 42,510
Banana Belt, Montana
Actually a 1-9 would work fine in western Colorado, just as well as a 1-8 a lower elevations.


John

"Gunwriters, as you know, aren't as informed as their readers are and if it wasn't for the readers, there would be no need for writers..."--Shrapnel, May 2015
#11986169 - 04/20/17 Re: Twist rate of a 264 win in Remington SS CDL ? [Re: Cntrmass]  
Joined: Nov 2009
Posts: 407
BruinPoint Offline
Campfire Regular
BruinPoint  Offline
Campfire Regular

Joined: Nov 2009
Posts: 407
Western Colorado
The idea was for it to be a gun for Texas/Mexico/Arizona Whitetail and Coues so the elevation here (which is still only 4,500ft) wasn't a real factor and I don't imagine regretting a 1:8 if I get a choice.

I'm sure there is better terminology but when I finally had enough of my CDL the gunsmith showed me how far off the bore was from being in the center of the barrel at the crown then with a bore scope he showed me the marks from where the bit had "chattered" its way down the bore. Not Big Green's finest rifle but I still drool over a .264 Sendero II.

#11986254 - 04/20/17 Re: Twist rate of a 264 win in Remington SS CDL ? [Re: Cntrmass]  
Joined: May 2005
Posts: 825
Cntrmass Offline
Campfire Regular
Cntrmass  Offline
Campfire Regular

Joined: May 2005
Posts: 825
Big Sky Country
So the factory twist may not stabilize the Berger vlds?

#11986329 - 04/20/17 Re: Twist rate of a 264 win in Remington SS CDL ? [Re: Cntrmass]  
Joined: Feb 2015
Posts: 61
cdparker Offline
Member
cdparker  Offline
Member

Joined: Feb 2015
Posts: 61
Valley Trash, Alaska
As long as your gun has a magnum bolt face, magazine and follower; my thought would be to rebarrel it to an 8 twist 26 Nosler. That would be a really go fast hunting gun.
Just a thought.


Presidents 100-'97
Distinguished Rifleman-'81
NRA Benefactor
Artillery lends dignity to what would otherwise be a vulgar brawl.
#11986432 - 04/20/17 Re: Twist rate of a 264 win in Remington SS CDL ? [Re: Cntrmass]  
Joined: Feb 2009
Posts: 2,734
joshf303 Offline
Campfire Guide
joshf303  Offline
Campfire Guide

Joined: Feb 2009
Posts: 2,734
South TX
Originally Posted by Cntrmass
So the factory twist may not stabilize the Berger vlds?



I've had two, bone stock 700 .264 WMs and had no problems with the Berger 140s or Scenar 139s at sea level.

#11986535 - 04/20/17 Re: Twist rate of a 264 win in Remington SS CDL ? [Re: Cntrmass]  
Joined: Apr 2011
Posts: 11,261
hanco Offline
Campfire 'Bwana
hanco  Offline
Campfire 'Bwana

Joined: Apr 2011
Posts: 11,261
Texas
I shot the 140 VLDs in my pre 64 westerner. They shot fine.

#11986732 - 04/20/17 Re: Twist rate of a 264 win in Remington SS CDL ? [Re: hanco]  
Joined: Jul 2001
Posts: 42,510
Mule Deer Offline
Campfire Oracle
Mule Deer  Offline
Campfire Oracle

Joined: Jul 2001
Posts: 42,510
Banana Belt, Montana
A lot depends on temperature as well as elevation. In warmer weather (typical of Texas) a "slow" twist will stabilize bullets that the same twist won't in truly cold weather--a potential problem here in western Montana, though it's somewhat counteracted by the higher elevation.

The rule-of-thumb is that every 5000 feet of additional elevation acts about like a 1" faster twist. So if you have a 1-9 twist 6.5mm barrel and don't shoot at any lower than 4000 feet in elevation, it will stabilize even with 140 Berger VLD's even at -20 Fahrenheit. The stabilization won't be enough to optimize ballistic coefficient, but the bullets will remain point on and probably be pretty accurate.

The 4000 feet is my situation, by the way. The town we live in is at 3900 feet, right along the Missouri River in the bottom of the valley, so every place else around here is even higher, including the two ranges I shoot at. As a result a 1-9 twist works for any 6.5mm round with 140 VLD's.

Even at sea level a 1-9 should stabilize (but not optimize) a 140 VLD down to -20 degrees. The reason many prefer a 1-8 twist isn't because it won't keep a 140 VLD point-on, or prevent them from shooting accurately, is that BC isn't optimized until the Sg is 1.5 or more.

Sg is a number assigned to a bullet's stability in a certain twist and conditions, with 1.0 the minimum needed for stabilization. But BC will increase up to a 1.5 SG, which is why many prefer a 1-8 twist, not because a 1-9 twist won't stabilize long 140-grain bullets. But it will result in a 1.5 Sg at 7000 feet above sea level, at a typical fall hunting temperature of 35 degrees.

Bullet stabilization isn't a simple either/or situation. It's affected not just by rifling twist, but by temperature, elevation and whether or not you want the highest BC the bullet's capable of.


John

"Gunwriters, as you know, aren't as informed as their readers are and if it wasn't for the readers, there would be no need for writers..."--Shrapnel, May 2015
#11989682 - 04/22/17 Re: Twist rate of a 264 win in Remington SS CDL ? [Re: Cntrmass]  
Joined: May 2005
Posts: 825
Cntrmass Offline
Campfire Regular
Cntrmass  Offline
Campfire Regular

Joined: May 2005
Posts: 825
Big Sky Country
Thanks, just wondering how the vlds will shoot.
I run 130 grain sciroccos now. The shoot pretty well.


Moderated by  RickBin, SYSOP 

AIH 160 1
Who's Online Now
128 registered members (4winds, 1legmont, 204guy, 1sgLunde, 300Winnie, 309coug, 21 invisible), 606 guests, and 650 spiders.
Key: Admin, Global Mod, Mod
RBCN 160 3









Copyright © 2000-2018 24hourcampfire.com, Inc. All Rights Reserved.
 
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.067s Queries: 14 (0.004s) Memory: 0.9594 MB (Peak: 1.1836 MB) Zlib enabled. Server Time: 2017-10-20 06:48:09 UTC