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#6907180 - 10/03/17 09:39 AM 7 Twist for 6.5 Creedmoor???
Buzzsaw Online   content
THF Trophy Hunter

Registered: 06/29/11
Posts: 9929
Loc: Frisco, Texas
I know 8 is "standard" but tell me if 7" has any advantage.
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#6907203 - 10/03/17 09:52 AM Re: 7 Twist for 6.5 Creedmoor??? [Re: Buzzsaw]
Pig_Popper Online   content
Pro Tracker

Registered: 08/16/15
Posts: 1059
Loc: Fort Worth
I would try a 7.5 before a 7, I've done this with some 308 guns (9.5 twist) without any degradation to accuracy and I'm still different enough to say I don't shoot a standard twist banana
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#6907206 - 10/03/17 09:53 AM Re: 7 Twist for 6.5 Creedmoor??? [Re: Buzzsaw]
ChadTRG42 Offline
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Registered: 09/16/09
Posts: 11348
Loc: Lewisville, TX
Yes. The main advantage going to a 7" twist would give you more stability (or less chance of the lack of stability) as the bullet goes transonic and into subsonic flight at longer ranges. This distance wouldn't be until 1200-1500 yards, though.

Also, Berger is developing a 155 grain 6.5mm bullet. Rumor has it, that it will need a 1:7" twist. At the speeds of a 6.5 CM, a 155 would be going about 2550 fps, which is pretty slow, even for a good, high BC bullet.

Also, if you were playing with subsonic ammo, it would help stabilize the heavy and slow bullets. 6.5mm subs are fun with the 160 grain RN bullets!
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#6907268 - 10/03/17 10:38 AM Re: 7 Twist for 6.5 Creedmoor??? [Re: Buzzsaw]
FiremanJG Online   content
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Registered: 12/16/08
Posts: 21353
Loc: Wolfe City, TX
Originally Posted By: Buzzsaw
I know 8 is "standard" but tell me if 7" has any advantage.


Not for me.

I use a 1:8.5 as it is, and run 140's a tad faster than most everyone else does.

Last time I took it past 1000 yards, was 1350 yards, in July. Any farther and I'll grab the 7 Rem Mag, and 180's.
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#6907340 - 10/03/17 11:30 AM Re: 7 Twist for 6.5 Creedmoor??? [Re: Buzzsaw]
blackcoal Online   content
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Registered: 01/19/12
Posts: 8982
Loc: 60 Mi North of DFW
Agree with Chad.
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#6907789 - 10/03/17 04:55 PM Re: 7 Twist for 6.5 Creedmoor??? [Re: Buzzsaw]
Buzzsaw Online   content
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Registered: 06/29/11
Posts: 9929
Loc: Frisco, Texas
This would be on a hunting rifle. It appears the Germans are ahead of us on this 7 twist offering in a factory rifle.
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#6907861 - 10/03/17 05:46 PM Re: 7 Twist for 6.5 Creedmoor??? [Re: Buzzsaw]
kmon1 Offline
junior

Registered: 09/27/06
Posts: 21974
Loc: Texas
The 6.5's I have are

6.5 Grendel one has 1:8 and the other 1:8.4
6.5X54 MS has 1:9 and was designed for the 160gr Round nose bullets even with its less than 2300fps starting velocity. If those bullets were yawing I doubt Bell would have killed over 300 elephants with it.
6.5-284 Norma has a 1:9 and does well with Breger 140 VLDs
264 Win Mag has 1:9 and does good with the Bergers

I do not shoot as far as some and might run into issues past 800 yards if I shot that far but inside 800 no problems running those twist rates. On Range, haven't shot the MS past 150 yards, Grendel out to 600, 284 to 790 and 264 o 500 yards.

If I were trying to shoot the 155VLDs that are on the way a new barrel with a faster twist might be in order though.


Edited by kmon1 (10/03/17 05:51 PM)
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#6907883 - 10/03/17 06:01 PM Re: 7 Twist for 6.5 Creedmoor??? [Re: Buzzsaw]
patriot07 Offline
Pro Tracker

Registered: 11/06/11
Posts: 1681
Loc: Royse City, TX
I tend to agree that the 155 would be going incredibly slow (probably too slow) in a 6.5 creedmoor.

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#6907885 - 10/03/17 06:02 PM Re: 7 Twist for 6.5 Creedmoor??? [Re: Buzzsaw]
FiremanJG Online   content
THF Celebrity

Registered: 12/16/08
Posts: 21353
Loc: Wolfe City, TX
Some things to consider.

Adding twist rate will often mean a loss in some velocity.

If you want to run the new 155 gr 6.5mm bullets, the 6.5 Creedmoor is not the case I would load them in. It just can drive them fast enough to give better performance than the 140, 147 gr. It would need more fuel, so go to a different cartridge that holds more fuel. Same as a 230 gr .30 cal VLD in a .308 Winchester. High BC, but it'll be so stinking slow, it's not doing any good.

Again, I've had zero trouble shooting a 140 gr a Hell of a long ways, with a 1:8.5 twist 6.5 Creedmoor , and most everyone else has zero trouble with a 1:8.
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#6907891 - 10/03/17 06:07 PM Re: 7 Twist for 6.5 Creedmoor??? [Re: Buzzsaw]
FiremanJG Online   content
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Registered: 12/16/08
Posts: 21353
Loc: Wolfe City, TX
Hand me a box of the 155 VLDs, and say "make them go". And I'm going to run the twist Berger recommends, and load them in a 6.5 SAUM, 26 Nosler, or some other option that will drive them fast enough.
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#6908514 - 10/04/17 09:45 AM Re: 7 Twist for 6.5 Creedmoor??? [Re: FiremanJG]
colt45 Online   content
THF Trophy Hunter

Registered: 08/19/06
Posts: 7185
Loc: bastrop county
Originally Posted By: FiremanJG
Originally Posted By: Buzzsaw
I know 8 is "standard" but tell me if 7" has any advantage.


Not for me.

I use a 1:8.5 as it is, and run 140's a tad faster than most everyone else does.

Last time I took it past 1000 yards, was 1350 yards, in July. Any farther and I'll grab the 7 Rem Mag, and 180's.
exactly what I used on my Fierce, brand new, amazing results
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#6908575 - 10/04/17 10:38 AM Re: 7 Twist for 6.5 Creedmoor??? [Re: Buzzsaw]
Judd Online   content


Registered: 01/22/09
Posts: 11334
Loc: Sachse, TX
Waste of twist wink
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#6908642 - 10/04/17 11:19 AM Re: 7 Twist for 6.5 Creedmoor??? [Re: colt45]
FiremanJG Online   content
THF Celebrity

Registered: 12/16/08
Posts: 21353
Loc: Wolfe City, TX
Originally Posted By: colt45
Originally Posted By: FiremanJG
Originally Posted By: Buzzsaw
I know 8 is "standard" but tell me if 7" has any advantage.


Not for me.

I use a 1:8.5 as it is, and run 140's a tad faster than most everyone else does.

Last time I took it past 1000 yards, was 1350 yards, in July. Any farther and I'll grab the 7 Rem Mag, and 180's.
exactly what I used on my Fierce, brand new, amazing results


What is exactly what you use?
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#6915579 - 10/10/17 11:17 AM Re: 7 Twist for 6.5 Creedmoor??? [Re: Buzzsaw]
6.5BR Offline
Outdoorsman

Registered: 09/20/13
Posts: 71
I am all for faster twist...to a point. Never over twisted a bullet....but don't over think this.

If a specialty application where you can/will seat the new 155s out...vs robbing case capacity in a modest short action case with COL restrictions...then consider faster than 8.

FWIW, I use 8 on all 6 and 6.5s, 9 on 7mm. I like to K.I.S.S.

As to the 8.5 above, cannot argue with success.

One can "tweak things" but often times, folks try hard to "re-invent the wheel" - often the R&D has been done. Granted, Rem strangled the 6.5-308 A-square from the launch.....but Big Green has not been known to make the best of decisions...always focusing on counting beans, which is why they are followers, not leaders.
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#6915588 - 10/10/17 11:32 AM Re: 7 Twist for 6.5 Creedmoor??? [Re: Buzzsaw]
Txhillbilly Offline
Tracker

Registered: 08/14/15
Posts: 554
Loc: Johnson County
I've never had any problems shooting a 160 gr Sierra out of my 6.5-06 with a 1-8 twist,and I'm looking forward to trying the 155's when they come out. It sucks that Sierra discontinued the 160 gr 6.5mm bullet,but I have enough to last me the rest of my life for hunting.

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