|
Joined: Dec 2005
Posts: 2,587
Campfire Regular
|
OP
Campfire Regular
Joined: Dec 2005
Posts: 2,587 |
What would the best twist rate to get for a 25-06?
Rob
|
|
|
|
Joined: Sep 2011
Posts: 2,038
Campfire Regular
|
Campfire Regular
Joined: Sep 2011
Posts: 2,038 |
Traditional is 10-twist. That will be good for most 25-06 bullets.
However, that will only be good for marginal stability with the Berger 115s. If you wanted to shoot those bullets, you might consider a 9 or 9.5 twist.
v/r Joel
|
|
|
|
Joined: May 2004
Posts: 2,676
Campfire Regular
|
Campfire Regular
Joined: May 2004
Posts: 2,676 |
For myself, getting a custom barrel I'd go 1-9 for sure. I've had a couple 1-10 factory guns that wouldn't shoot heavier bullets decently at all, and one custom tube that was also troublesome (to the point of getting sold at a significant loss). I've also had a couple factory 1-10s shoot very well, more so with 100 grains than heavier bullets though.
|
|
|
|
Joined: Mar 2001
Posts: 4,584
Campfire Tracker
|
Campfire Tracker
Joined: Mar 2001
Posts: 4,584 |
1-9 at least, I wouldn't be scared of a 1-8.
Anybody who seriously concerns themselves with the adequacy of a Big 7mm for anything we hunt here short of brown bear, is a dufus. They are mostly making shidt up. Crunch! Nite-nite!
Stolen from an erudite CF member.
|
|
|
|
Joined: Dec 2005
Posts: 2,587
Campfire Regular
|
OP
Campfire Regular
Joined: Dec 2005
Posts: 2,587 |
Shilen offers a 1 in 9 twist but nothing faster for a 25-06 so thats what I will go with I guess..
Thanks!
Rob
|
|
|
|
Joined: Mar 2001
Posts: 4,584
Campfire Tracker
|
Campfire Tracker
Joined: Mar 2001
Posts: 4,584 |
1-9 is absolutely fine. Don't lose any more sleep over the twist.
Anybody who seriously concerns themselves with the adequacy of a Big 7mm for anything we hunt here short of brown bear, is a dufus. They are mostly making shidt up. Crunch! Nite-nite!
Stolen from an erudite CF member.
|
|
|
|
Joined: Jun 2004
Posts: 7,197 Likes: 6
Campfire Tracker
|
Campfire Tracker
Joined: Jun 2004
Posts: 7,197 Likes: 6 |
When thinking of a barrel twist for a 25, it might pay to think of it as a 6.5 since the .007" difference isn't really all that significant. In 25 caliber, the 120 is percieved as being a long, heavy bullet. In a 6.5, it's a lightweight. Perception. This is evn more apparent when you measure the length of the bullets. A 120 grain Speer spitzer in 25 cal is 1.075" long. The same weight bullet from the same maker in 6.5 mm is 1.070. By way of comparison, the 140 graim 6.5 is 1.2 inches long. Now, a nine twist will stabilize a 6.5 140 just fine. A twelve inch twist will stabilize the 120. Reduce the diameter to .257, and things don't change much. I don't have a Berger 115 to measure so I can't comment on it. I also don't have a Barnes 120. These bullets may be long enough that the standard ten inch twist won't handle them but I can't say for sure. I do know that for myself, I would use a ten, for a customer, I would do what I was asked to do! GD
|
|
|
|
Joined: Mar 2001
Posts: 4,584
Campfire Tracker
|
Campfire Tracker
Joined: Mar 2001
Posts: 4,584 |
Greydog is of course right.
So why do I recommend 9 twist? A few years ago I had a "10 twist" Shilen chambered in 257 Roberts AI. With bullets up to the 100 B Tip in length, it would shoot 3/4 MOA at worst. Anything longer it opened up closer to 3 MOA. Bullets like a 100 TTSX or a Berger 115 VLD were a pipe dream in that barrel.
The cleaning rod told me that although spec'ed 10 it was more like 10 3/8". Since the extra twist doesn't hurt anything I hedge my bets. In fact some might argue faster twists blow up varmints better and are more decisive on larger game.
Anybody who seriously concerns themselves with the adequacy of a Big 7mm for anything we hunt here short of brown bear, is a dufus. They are mostly making shidt up. Crunch! Nite-nite!
Stolen from an erudite CF member.
|
|
|
|
Joined: Aug 2005
Posts: 11,357
Campfire Outfitter
|
Campfire Outfitter
Joined: Aug 2005
Posts: 11,357 |
Our Hart barrel is a 10 twist and it shoots 115 grainers quite well. I typically twist fast however that rig sure does fine with a variety of bullet weights. If I want to run high bc bullets, I just grab the 6.5-06 twisted 8.
|
|
|
|
Joined: Jul 2008
Posts: 2,961
Campfire Regular
|
Campfire Regular
Joined: Jul 2008
Posts: 2,961 |
|
|
|
|
Joined: Dec 2005
Posts: 2,587
Campfire Regular
|
OP
Campfire Regular
Joined: Dec 2005
Posts: 2,587 |
Rob
|
|
|
|
Joined: Dec 2005
Posts: 2,587
Campfire Regular
|
OP
Campfire Regular
Joined: Dec 2005
Posts: 2,587 |
Rob
|
|
|
|
Joined: Oct 2002
Posts: 96,121 Likes: 1
Campfire Oracle
|
Campfire Oracle
Joined: Oct 2002
Posts: 96,121 Likes: 1 |
Greydog is of course right.
So why do I recommend 9 twist? A few years ago I had a "10 twist" Shilen chambered in 257 Roberts AI. With bullets up to the 100 B Tip in length, it would shoot 3/4 MOA at worst. Anything longer it opened up closer to 3 MOA. Bullets like a 100 TTSX or a Berger 115 VLD were a pipe dream in that barrel.
The cleaning rod told me that although spec'ed 10 it was more like 10 3/8". Since the extra twist doesn't hurt anything I hedge my bets. In fact some might argue faster twists blow up varmints better and are more decisive on larger game. Then start shooting that in 20 below weather and see the wheels really fall off. 9 all the way
"Dear Lord, save me from Your followers"
|
|
|
|
Joined: Nov 2007
Posts: 29,670 Likes: 5
Campfire Ranger
|
Campfire Ranger
Joined: Nov 2007
Posts: 29,670 Likes: 5 |
+1 I have a 10" 257 AI that shoots bug holes w/ anything the length of a 100 gr Interlock or shorter, but the 100 gr NBTs are even too long for sub-MOA much less VLDs. When I do a custom Roy or 25-06 AI I'll certainly twist as fast as possible. Nothing lost!
|
|
|
|
Joined: Jan 2008
Posts: 2,067
Campfire Regular
|
Campfire Regular
Joined: Jan 2008
Posts: 2,067 |
considering that barnes says that their 115 might not work in 1-10 twists I would probably build on a 1-9
|
|
|
|
Joined: May 2005
Posts: 10,452
Campfire Outfitter
|
Campfire Outfitter
Joined: May 2005
Posts: 10,452 |
From Pac-nor's web site:
Caliber and Twist Rate Chart Highlighted numbers are standard or popular twist rates. 25 (.257") 3 groove 10" 12" 14" 4 groove 11" 5 groove 9" 10" 12" 6 groove 8" 14" Polygonal 10"
I have 1:9 barrels on a .250AI and a .25/06. Very happy with the results.
"Civilized men are more discourteous than savages because they know they can be impolite without having their skulls split, as a general thing." Robert E. Howard
|
|
|
|
Joined: Jun 2002
Posts: 11,955 Likes: 1
Campfire Outfitter
|
Campfire Outfitter
Joined: Jun 2002
Posts: 11,955 Likes: 1 |
I have a 9" PacNor enroute for a 250AI project. Hoping to use 115 ABs in it.
OTOH ... I have a 10" King bbl (257R) that won't shoot heavier than 100s, but then there's nothing wrong with 100gr Hornadys anyday.
|
|
|
|
Joined: Mar 2004
Posts: 7,128
Campfire Tracker
|
Campfire Tracker
Joined: Mar 2004
Posts: 7,128 |
I had a 1-10 twist 25-06 and it was very accurate with Hornady 120 hollow points. If I built another I would be tempted to try a slightly faster twist because of the rumored greater effectiveness on game. A 1-9 Pac-Nor #2 would be my choice.
|
|
|
|
Joined: Mar 2014
Posts: 3,344
Campfire Tracker
|
Campfire Tracker
Joined: Mar 2014
Posts: 3,344 |
Done in Convention by the Unanimous Consent of the States present the Seventeenth Day of September in the Year of our Lord one thousand seven hundred and Eighty seven.
|
|
|
|
Joined: Mar 2014
Posts: 3,344
Campfire Tracker
|
Campfire Tracker
Joined: Mar 2014
Posts: 3,344 |
From Pac-nor's web site:
Caliber and Twist Rate Chart Highlighted numbers are standard or popular twist rates. 25 (.257") 3 groove 10" 12" 14" 4 groove 11" 5 groove 9" 10" 12" 6 groove 8" 14" Polygonal 10"
I have 1:9 barrels on a .250AI and a .25/06. Very happy with the results. Hmmmmm 8 twist. Makes ya wonder if that fast twist critter damage at the end is true...
Done in Convention by the Unanimous Consent of the States present the Seventeenth Day of September in the Year of our Lord one thousand seven hundred and Eighty seven.
|
|
|
|
539 members (06hunter59, 163bc, 1lessdog, 1minute, 1badf350, 10ring1, 68 invisible),
2,542
guests, and
1,194
robots. |
Key:
Admin,
Global Mod,
Mod
|
|
Forums81
Topics1,193,785
Posts18,515,843
Members74,017
|
Most Online11,491 Jul 7th, 2023
|
|
|
|