Range Report 6.5mm twist rate advice 1:8 or 1:8.5"

[Guest]

In my research, I have found that most are running 1:8" twists in 6.5x47L. I have also seen that 139 & 140 grain has a recommended twist of 1:9"

I would like to take advantage of the 139grain, but I don't want limit myself with my twist. I have a 1:8.5" from a a previous build that didn't go through. Will it be enough for the 139 grain, or should I step up to 1:8" to really get the full benefit?

Also, if it makes any difference, I would prefer to use a shorter barrel on the rifle for practical reasons.

 

[ChadTRG42]

Re: 6.5mm twist rate advice 1:8 or 1:8.5"

A 1:8.5" twist will do fine. A 1:9" should also work, but isn't my first choice.

 

[Shady_Jay]

Re: 6.5mm twist rate advice 1:8 or 1:8.5"

8.5

 

[Rob01]

Re: 6.5mm twist rate advice 1:8 or 1:8.5"

8 or 8.5. I run an 8 twist in my 6.5 Creedmoor and it handles the 140s very nicely.

 

[Criver600]

Re: 6.5mm twist rate advice 1:8 or 1:8.5"

If your going to be shooting 140/142 in cool/cold weather go with the 8 twist. 9's will yaw in cool weather err on the conservative side.

 

[USSR]

Re: 6.5mm twist rate advice 1:8 or 1:8.5"

I shoot the 139-142gr bullets out to 1k without problems with my 1-8.5" twist 6.5x55.

Don

 

[427Cobra]

Re: 6.5mm twist rate advice 1:8 or 1:8.5"

I went with a 8 twist

 

[264shooter]

Re: 6.5mm twist rate advice 1:8 or 1:8.5"

I use 1 in 8 in my creedmoor. 139's are the heaviest I shoot.
Works good

 

[:X2:]

Re: 6.5mm twist rate advice 1:8 or 1:8.5"

1 in 9 on my 6.5XC, I can shoot up to a 147 gr bullet, 153gr's wouldnt stabalize, 142's shoot great year around where im at.






Edit to add: If I could do it all over again I would have gone with an 8.5 or 8

 

[wnroscoe]

Re: 6.5mm twist rate advice 1:8 or 1:8.5"

If you use a 1-8 by default in 6.5 you cant go wrong. It'll stablize 123's to 142's in 6.5 CM/47L to 6.5x284

 

[Moof]

Re: 6.5mm twist rate advice 1:8 or 1:8.5"

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: wnroscoe</div><div class="ubbcode-body">If you use a 1-8 by default in 6.5 you cant go wrong. It'll stablize 123's to 142's in 6.5 CM/47L to 6.5x284 </div></div>


+1

 

[dar1246]

Re: 6.5mm twist rate advice 1:8 or 1:8.5"

8.5 twist will do great.

 

[montyb]

Re: 6.5mm twist rate advice 1:8 or 1:8.5"



i run 6.5 bore tubes in 1-8", 1-8.5" and 1-9"

8" is my default nowadays. i see no downside

8.5" works almost as well

my 9" twist would stabilize 140 SMKs, but not the 142s

 

[JRose]

Re: 6.5mm twist rate advice 1:8 or 1:8.5"

8.5 works for me.

 

[Greg Langelius *]

Re: 6.5mm twist rate advice 1:8 or 1:8.5"

My 28" 1:8" works with 142's at 1Kyd, and 95's at 200yd. I try to keep teh lighter weight bullets at shorter distances. the book says they're reach, but they develop increased drop well beyond calculated values at extended distances. I suspect a slower twist might help with that, but until I can save up my pennies for a new barrel, I can't prove it.

 

[Jedi]

Re: 6.5mm twist rate advice 1:8 or 1:8.5"

what bullet do you plan on shooting

Most bullet manufacturers recommend twist rate for given bullets, follow whatever they advise..pert easy

 

[steve123]

Re: 6.5mm twist rate advice 1:8 or 1:8.5"

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: X2</div><div class="ubbcode-body">1 in 9 on my 6.5XC, I can shoot up to a 147 gr bullet, 153gr's wouldnt stabalize, 142's shoot great year around where im at.






Edit to add: If I could do it all over again I would have gone with an 8.5 or 8 </div></div>

Where do you get 147 and 153 grain 6.5 bullets?

Steve

 

[earthquake]

Re: 6.5mm twist rate advice 1:8 or 1:8.5"

Tag. I'm picking up a 1:8.5 for a Creedmoor build. Amazing what the Google search function will do for ya!

 

[leadbullet]

Re: 6.5mm twist rate advice 1:8 or 1:8.5"

i have a 24" Benchmark 1-8 twist in 260 rem, it shoots the 142 SMK at 2850 fps and 1250yds is too easy.

 

[VKC]

Re: 6.5mm twist rate advice 1:8 or 1:8.5"

1 in 8.5" for 6.5x47L as you are more limited in case capacity than 6.5cm or 260rem, and thus will be better off pushing the 120 to 130grs faster.

 

[Jaxdialation]

Re: 6.5mm twist rate advice 1:8 or 1:8.5"

I'd like to know about those 147 and 153gr bullets for 6.5 as well.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: steve123</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: X2</div><div class="ubbcode-body">1 in 9 on my 6.5XC, I can shoot up to a 147 gr bullet, 153gr's wouldnt stabalize, 142's shoot great year around where im at.
Edit to add: If I could do it all over again I would have gone with an 8.5 or 8 </div></div>

Where do you get 147 and 153 grain 6.5 bullets?

Steve </div></div>

 

[majohnson2]

Re: 6.5mm twist rate advice 1:8 or 1:8.5"

My 6.5 CM has a Kreiger barrel with a finished length 28" 8.5 twist, it does a great job with 140gr bullets.

 

[earthquake]

Re: 6.5mm twist rate advice 1:8 or 1:8.5"

I think I'm going to finish at 24" with a Bartlein 1:8.5 twist 5R in Creedmoor. Does this sound like a good build? No idea what size bullet to use since I've only ever shot 7.62mm.

 

[Cologgi]

Re: 6.5mm twist rate advice 1:8 or 1:8.5"

I think that 8 or 8.5 is splitting hairs, either way will be fine. Mine is getting built in 8.5 to shoot 139's and 140's