190gr in a 1:11.27 twist?

[broylz]

im trying to get my build parts together and read something the other day that spoke about slower twists for better accuracy and mentioned using a 1:11 twist for 190s. has anyone else worked with this combo before?

im planning to build a m24 contour 30-06. I am used to shooting 168gr smks from a 308 so I would like to recreate this load. I also hunt with 165gr NBTs but would like to play with M118LR equivalent loads and load up some hot 190gr loads when I want to reach out a bit more. I don't see myself playing with much above the 190 grain loads as they will easily handle anything I want to do. I know the traditional standard for 30-06 and 300WM is a 1:10 twist but should I be good with a 1:11.27 5R Bartlein?

 

[SaepeExertus]

http://www.snipershide.com/shooting...-ballistics/190944-very-fast-twist-rates.html

Check out this thread, just a little food for thought. The article by Todd Hodnett they're discussing was an insightful read and had some interesting ideas on twist rate.

 

[Underthegun]

I have the same twist and have no problem using Berger 185gr VLDs

 

[Blackbrush]

190gr in a 1:11.27 twist?

I've been shooting 200 SBT Gamekings and 200 Accubonds in a Rock w that same twist. Gtg. ....at 1100ft elev

 

[Niles Coyote]

I have a host of 1:12's a 1:11.27 and a new 1:8, the first two will both stabilize 190 Berger VLD's with out issue. Still working on the 1:8 with 175's, 190's and 208's... I am beginning to believe (contrary to what Todd wrote in the Sniper magazine article) one can over stabilized a bullet. IMO, if one is buying a barrel and isn't intending on shooting sub sonic loads a 1:11 twist would be the best all around 308 twist for 155-200+ grain bullets.

Just something to stir the pot... Guys, here on the forum, are having success with 208's launched from 12 twist 308's. I have not tried them in anything but my 1:8... and the jury is still out.

 

[Frank Green]

It should be a 1-11.25 twist unless someone/you specifically ordered a 11.27 but I cannot think of any recently at all.

A 1-12 twist with conventional type bullets will stabilize up to 190's even at .308win. velocities.

Later, Frank
Bartlein Barrels

 

[Delta4-3]

I run a 1:8" 308 with good accuracy results with a wide range of projectiles.

I have a host of 1:12's a 1:11.27 and a new 1:8, the first two will both stabilize 190 Berger VLD's with out issue. Still working on the 1:8 with 175's, 190's and 208's... I am beginning to believe (contrary to what Todd wrote in the Sniper magazine article) one can over stabilized a bullet. IMO, if one is buying a barrel and isn't intending on shooting sub sonic loads a 1:11 twist would be the best all around 308 twist for 155-200+ grain bullets.

Just something to stir the pot... Guys, here on the forum, are having success with 208's launched from 12 twist 308's. I have not tried them in anything but my 1:8... and the jury is still out.

 

[Niles Coyote]

I run a 1:8" 308 with good accuracy results with a wide range of projectiles.

That's good to hear. Are you running them fast (2400-2600fps) or subsonic? In groups of 5-10 ~ 30% will be fliers... and its is not me. Groups will be around .5-.75 moa with fliers opening it up to 1-1.5 moa at 100-300y and I have tried berger and sierra bullets so I don't think it is a bullet quality issue. The barrel is a AAC 18" Remington prefit...

 

[Frank Green]

That's good to hear. Are you running them fast (2400-2600fps) or subsonic? In groups of 5-10 ~ 30% will be fliers... and its is not me. Groups will be around .5-.75 moa with fliers opening it up to 1-1.5 moa at 100-300y and I have tried berger and sierra bullets so I don't think it is a bullet quality issue. The barrel is a AAC 18" Remington prefit...

The key to running a faster twist and lighter bullets is make sure the ammo and or bullets are of good quality. Any run out the ammo/bullets have the faster twist will amplify the run out and cause the groups to get bigger/throw fliers.

Also check your chamber for run out. I've seen factory chambers with run out especially up in the throat area off as much as .004". You could clearly see where the chamber cut on one side of the throat and didn't even touch the other side of the barrel. The quality of the barrel and gun smithing work plays a part as well.

Later, Frank
Bartlein Barrels

 

[Niles Coyote]

Thanks Frank! I will check my run out.

 

[Delta4-3]

That's good to hear. Are you running them fast (2400-2600fps) or subsonic? In groups of 5-10 ~ 30% will be fliers... and its is not me. Groups will be around .5-.75 moa with fliers opening it up to 1-1.5 moa at 100-300y and I have tried berger and sierra bullets so I don't think it is a bullet quality issue. The barrel is a AAC 18" Remington prefit...

I run both super and sub. Everything has to be concentric, and I have dealt with a lot of the rem/AAC barrels that had a chamber off center from the bore, along with a lot of other issues. I run the 208 AMax's for sub and super, but also shoot pull down 175 SMK's, 250g cast bullet, and several random hunting bullets.

 

[gstaylorg]

I've shot many the CorBon Factory SMK190 load out of a GAP Hospitaller (24" 5R Bartlein, .299/.308, GAP#7 contour, 1.11.25-twist). MV is in the neighborhood of 2575 fps and they perform quite well out to 600 yd (never tried them any farther). Unless you're talking about a VLD- or hybrid-like 190 gr projectile that is much longer than the SMK190, you should be GTG.

 

[broylz]

It should be a 1-11.25 twist unless someone/you specifically ordered a 11.27 but I cannot think of any recently at all.

A 1-12 twist with conventional type bullets will stabilize up to 190's even at .308win. velocities.

Later, Frank
Bartlein Barrels

My mistake. not sure why I was thinking 11.27. they are listed as 11.25 at Bugholes...

I've shot many the CorBon Factory SMK190 load out of a GAP Hospitaller (24" 5R Bartlein, .299/.308, GAP#7 contour, 1.11.25-twist). MV is in the neighborhood of 2575 fps and they perform quite well out to 600 yd (never tried them any farther). Unless you're talking about a VLD- or hybrid-like 190 gr projectile that is much longer than the SMK190, you should be GTG.

I am planning on testing out the 190gr Accubond Long Range when they are released this fall.

 

[Aimsmall55]

Fwiw , I have shot the 208 amax out of a GaP Crusader with OUTSTANDING results. It's a 1:11.25. Only a 22" bartlein but they shot so well I built another one with a 28" bartlein and am planning to shoot them in ftr.
Here's 5 at 500 yds with 42.0 varget and a 208 at 2.830". Warning .... DO NOT ATTEMPT THIS LOAD AS IT WAS HOT

 

[Aimsmall55]

Sorry forgot to finish. I know these ate not the 190's but was just trying to relay that it very well might stabilize them. Funny though, I tried the 185 Berger Hybrids and they wouldn't shoot for Sh%*. They were a full 100/1000's shorter too... Beats me!