twist rate for 6.5 06

[roninflag]

i have two 6.5-284s . rem 700 / krieger. they are 8.5 twist. i would not go faster than 1-8

 

[HandgunHTR]

Mine is a 1-8" twist. It shoots everything from the 120s to the 140s very well.

 

[Hugnot]

I have 2, McGowen barreled 6.5-06, both 8 twist, 5R rifling. For deers & such I would use a good pointy 130-140 grain lead core bullet or the 6.5, 127 Barnes LR bullet. I shoot rodents with the 123 ELD. I consider form factors when making bullet selections. Now, I am using VN 165, can't get RL 23 that would be first choice.

Form Factor Info:

The Berger 130 VLD hunting bullet looks real good on paper, higher velocity than 140's & same form factor.

Volume shooting prairie dogs with a 6.5-06 is like swatting gnats with a hammer - but OK for slow timed shots at extended ranges. The 123 works out better than 100's or 95 VMax for ranges over 400.

 

[Okdeerman]

what action? what barrrel?

I have 2, McGowen barreled 6.5-06, both 8 twist, 5R rifling. For deers & such I would use a good pointy 130-140 grain lead core bullet or the 6.5, 127 Barnes LR bullet. I shoot rodents with the 123 ELD. I consider form factors when making bullet selections. Now, I am using VN 165, can't get RL 23 that would be first choice.

Form Factor Info:
View attachment 454256

The Berger 130 VLD hunting bullet looks real good on paper, higher velocity than 140's & same form factor.

Volume shooting prairie dogs with a 6.5-06 is like swatting gnats with a hammer - but OK for slow timed shots at extended ranges. The 123 works out better than 100's or 95 VMax for ranges over 400.

Thanks for the good "usable" information

 

[The Badger]

I'm using a 1 in 8 twist in a 25" #3 Bartlien. Shoots 130 and 140's very well.

 

[MagnumManiac]

Because you have the choice, go 1:8" twist. I have factory 6.5's with 1:9" twist, they top out with 140/142g pills. My customs, 6.5x47, a few 264WM's and a 6.5-284 all have 1:8" twist. Now, I had a Mauser '96 made by Carl Gustav that had a 4 groove 1:7" twist military barrel on it and it was chambered in 6.5x55 Swede, OMG, that rifle was so accurate it was phenomenal for a military piece.
If you're going to be shooting the heavies, a 1:7" twist is also a great option, and it will not affect the lighter bullets accuracy, as there is no such thing as "over spinning" a bullet.

Cheers.

 

[Hugnot]

The Miller Twist Calculator, an estimator, is used by JBM & Berger for determining twist rates needed for adequate stability - Sg. The math is involved but not rocket science. An adequate Sg value should not be less than 1.4. Environmental factors affecting bullet stability are temperature and barometric pressure. Barometric pressure will vary with altitude - higher is lower. Humidity affects barometric pressure as the hydrogen molecules in water vapor are lighter than nitrogen molecules - humid is lower pressure.

A Sg (stabilty) table for 3, 6.5 hunting bullets that would work real good for shooting deers using a 6.5-06.


A table showing form factors for these & other 6.5 bullets


I would not consider any new 6.5-06 barrel with a twist rate slower than 8. The Berger 130 VLD looks like a good choice as its form factor is among the lowest and its lighter weight would allow greater velocities than 140 grain bullets. The 130 Berger VLD bullet should be able to kill deers good as they are not big, massive hugely heavy boned animals.

My self-imposed limit for shooting deers is 400 yards and I would shoot 127 Barnes 6.5 tipped long range bullets. Nice broadside shots on the deers are not always possible & the solid copper Barnes bullets can shoot thru 3 feet of deer if needed.

Adding Sg values for the Barnes 127 6.5 long range BT bullet:



The 127 Barnes would shoot good from a 9 twist, like don't re-barrel an existing 9 twist to an 8 twist for shooting deers if the 127 Barnes bullets shoot good in your rifle.

 

[sable tireur]

Now, I had a Mauser '96 made by Carl Gustav that had a 4 groove 1:7" twist military barrel on it and it was chambered in 6.5x55 Swede, OMG, that rifle was so accurate it was phenomenal for a military piece.

According to "Mauser Bolt Rifles" by Ludwig Olsen, the M94 has a 17.71" barrel length with a 1 in 7.87" right hand twist. The M96 has a 29.10" barrel and 1 in 7.87" right hand twist. The M38 is a 23.6" barrel with a 1 in 7.87" right hand. They were made to shoot a 156grain round nose bullet. Later (1941) they changed their ammo to a 139 grain boat tail and it still worked fine.

 

[MagnumManiac]

According to "Mauser Bolt Rifles" by Ludwig Olsen, the M94 has a 17.71" barrel length with a 1 in 7.87" right hand twist. The M96 has a 29.10" barrel and 1 in 7.87" right hand twist. The M38 is a 23.6" barrel with a 1 in 7.87" right hand. They were made to shoot a 156grain round nose bullet. Later (1941) they changed their ammo to a 139 grain boat tail and it still worked fine.

Made by whom does it quote?
I measured the twist accurately, it was a 1936 model made at the Carl Gustav plant, other models, like the M38 were made elsewhere.
Some models were even made at Brno in the CZ plants of the time.

Cheers.

 

[Hugnot]

According to "Mauser Bolt Rifles" by Ludwig Olsen, the M94 has a 17.71" barrel length with a 1 in 7.87" right hand twist. The M96 has a 29.10" barrel and 1 in 7.87" right hand twist. The M38 is a 23.6" barrel with a 1 in 7.87" right hand. They were made to shoot a 156grain round nose bullet. Later (1941) they changed their ammo to a 139 grain boat tail and it still worked fine.

Metric stuff always looks funny. The 7.87 would have a 1 - 200 (199.898) mm twist or a 1 - 20 (19.989) cm twist.

 

[sable tireur]

200mm = 7.874 according to the factories and the real experts regarding the Swedish Mauser models. Obviously your measurements differ from the standard.

Have a great day!

 

[KurtB]

8 twisted Hart on a 6.5-06. Changed to an 8 twist Benchmark on a 6.5-284. 8 twist bartlein on a 6.5x47. 8 twist light palma on a 6.5x47 Hawk Hill, 8 twist #2 Hawk Hill on a 6.5 creedmoor. They all can shoot 130-156 bullets fine. Not saying a 7 twist or a 9 twist won't, but seems like an easy button to hit the 8. Or maybe a 7.5 if lower elevation.

Sorry I added some cartridges that weren't 6.5-06 and hope it doesn't sidetrack the thread.