Creedmoor Twist Rate

[stevenedwards]

What do those with experience feel is the "correct" rate of rifling twist for a new creedmoor. I have in mind lead free ammo and ELD-X 142's.
Many thanks Steven

 

[jcampbellsmith]

1:8 or 1:7.5 would be my choice when I rebarrel my 260 Rems. Regards
JCS

 

[NigelM]

If I was building today I would go 1:7. Sierra have released a 150 grain that needs a 1:7.5, I think Berger and Hornaday will release 150+ bullets in the next few years that will need 1:7. I would rather be future proof and have never had an issue with too much twist when using heavy for calibre bullets. If you are shooting LR it's usually an advantage in low velocity stability.

 

[User00003]

1:7 if you want the benefit of the full weight range. That said, if pushing long heavy tablets you also want a barrel in the 24” range

 

[NigelM]

6.5 Creedmoor- Effect of Barrel Length on Velocity: Cutting up a Creedmoor!

Since its introduction by Hornady in 2007, the 6.5 Creedmoor (sometimes shortened to Creed) has established a strong foothold in the US rifle market. The 6.5 Creedmoor balances the excellent exter…

rifleshooter.com

Interesting article on 6.5 creedmoor barrel length here. For heavy bullets it looks like 24" is optimum. Lots of variables so not gospel, but interesting nonetheless.

 

[stevenedwards]

I wonder about a graduated twist ending at say 7.5. But in the real world I have not been able to find a production rifle with better than 1:8

 

[Muir]

I wonder about a graduated twist ending at say 7.5. But in the real world I have not been able to find a production rifle with better than 1:8

The standard 1:8 is just fine. WHen you get into the super heavy (and long) bullets there is a velocity trade off that I would rather avoid. With 140 and 143s and even 130's, I have shot at 1000 yards with minute of shooter accuracy.~Muir

 

[stevenedwards]

The standard 1:8 is just fine. WHen you get into the super heavy (and long) bullets there is a velocity trade off that I would rather avoid. With 140 and 143s and even 130's, I have shot at 1000 yards with minute of shooter accuracy.~Muir

Muir that is reassuring. I am only hunting and have the facility to practice up to 350 yards depending on the height of any crops !! Projectiles in the 120 to 140 range will suit me well.
Steven.

 

[ejg]

Barrel maker Hawk Hill only show 1/8 as their fastest 6.5 on their website. They supply quite a few to the PRS crowd.
edi

 

[NigelM]

Proof, Krieger and Shillen all offer 1:7 and 1:7.5 Edi.

 

[Muir]

Muir that is reassuring. I am only hunting and have the facility to practice up to 350 yards depending on the height of any crops !! Projectiles in the 120 to 140 range will suit me well.
Steven.

So how far will you be shooting when you hunt? 350 yards is a pretty easy shot for a 6.5 CM with a decent man behind the trigger. At our favorite range, the closest target is a 12" x 18" plate at 550 yards. We use if we think something has gone wonky with out glass or mounts just as a quick reference point to return to. The first 'serious' target is 675 yards and they progress outward across varying terrain (hills and ravines) out to a little over a mile. Out to a 1000 yards it is just a wind judging exercise with the Creedmoor if you've got your elevations dialed in. Even the 130 grain (Nosler RDF) get there with consistent accuracy. I don't shoot much past 1000 yards but I have watched MTLEADFARMER get repeated hits at 1500 with his 6.5 CM Ruger Precision.

120 and 140 grain bullets to 350 yards? Piece of cake....~Muir

 

[stevenedwards]

Muir, The farm land I stalk is predominantly fields, which are small even by our standards, peppered with lots of small patches of woodland. My usual range to target is 75 to 175 yards with the occasional targets so far to 260 yards with the 6.5x55. Looking to move out a little further with the CM when I have it settled in. The ability to get next to you deer is valued more than being able to shoot it in the next parish, there are no doubt competent exceptions. You will have noticed experienced members here responding to requests for advice on equipment regularly suggesting 6x46 and particularly 8x56 scopes "are all you need".
I am not sure that many stalkers have ready access to practice facilities at any distance, we live on an overcrowded island.


I am looking forward to my pieces of cake at 350yds, will report in.
Steven

 

[Muir]

For deer hunting I like to get close enough to smell them. The long range stuff is primarily for steel targets and prairiedogs tho Elk will test you. But then a 300 WM steps the game up.

Enjoy the cake.~Muir

 

[ejg]

Proof, Krieger and Shillen all offer 1:7 and 1:7.5 Edi.

I had a tour of Hawke Hill barrels company in Virginia today. We discussed twist rates in the 6.5's. They can and have made tighter twists but think the 1/8 is better. Anyway after a longer discussion I will be sticking to 1/8.
edi

 

[stevenedwards]

I had a tour of Hawke Hill barrels company in Virginia today. We discussed twist rates in the 6.5's. They can and have made tighter twists but think the 1/8 is better. Anyway after a longer discussion I will be sticking to 1/8.
edi

That is interesting and reassuring. Given the level of understanding on the topic why don't Mauser offer 1:8 in any 6.5's or indeed even respond to emails enquiring about the problem. A rifle for life they told me when sold to me and I had intended to add a 243 barrel at a later date so I only needed one rifle. That went well, no 1:8 twist in 243 either so second rifle. Steven

 

[Sharp shooter1]

I run a 1-8 for 143 eldx and it shoots 1/4moa.