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Posted: 3/20/2007 4:14:04 PM EST
I have'nt seen much discussion on the subject of barrel twist for the 6.8 SPC. I've noticed one barrel vendor is switching from a 1/10 twist to 1/11 twist. Considering the selection of commercial bullet weights of 110 and 115 grains can there be that big of a difference in performance?

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Link Posted: 3/21/2007 2:08:04 AM EST

Originally Posted By GBRaymer:
I have'nt seen much discussion on the subject of barrel twist for the 6.8 SPC. I've noticed one barrel vendor is switching from a 1/10 twist to 1/11 twist. Considering the selection of commercial bullet weights of 110 and 115 grains can there be that big of a difference in performance?



Do a search....that's a hot topic here....

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Link Posted: 3/21/2007 2:18:38 AM EST
Welcome aboard ,

Sorry but the guy above does not realize you are very limited on your search options here as you are not yet a team member.

Here are a couple threads discussing 6.8mm barrels and twists:

www.ar15.com/forums/topic.html?b=3&f=121&t=315437

www.ar15.com/forums/topic.html?b=3&f=121&t=318030

May get you started, please note that at the top of this forum there is boo-coo 6.8mm rifle info which you have probably already noticed, it's a good place to start.

FWIW, I have a CMMG 6.8mm 16" rifle and it prefers the Silver State 115grn SMKs.

Hope this helps,
mike
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Link Posted: 3/21/2007 6:19:09 AM EST
[Last Edit: 3/21/2007 6:30:16 AM EST by Ko-tonics]
<center id=center>Put your AR-15 on steroids: 6.8mm SPC</center id=center>
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Link Posted: 3/21/2007 9:03:27 AM EST
Tim is correct on all points and to add to that, with a slower twist you can go to a heavier bullet and have less concerns about pressures and get better velocites over the 1 in 10


Art - SSA

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Link Posted: 3/21/2007 1:33:23 PM EST



This is a 5 shot group at 100 yards with a 1/9.5 Kotonics barrel.

How much more accurate can 1/11 be?

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Link Posted: 3/21/2007 3:34:07 PM EST
[Last Edit: 3/21/2007 3:38:26 PM EST by DaveS]

Originally Posted By arteacher:
i176.photobucket.com/albums/w189/ar-15teacher/100_0532-1.jpg


This is a 5 shot group at 100 yards with a 1/9.5 Kotonics barrel.

How much more accurate can 1/11 be?


About another 67% tighter with me behind it.

BTW, you did real good with that Ko-tonics upper. Not too shabby at all.

I'd put money down on ya'.

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Link Posted: 3/21/2007 4:08:38 PM EST
ARTEACHER

What load are you using? hy.gif

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Link Posted: 3/21/2007 4:31:17 PM EST

Originally Posted By Atgr:
ARTEACHER

What load are you using?


Silver State brass, Rem 71/2 benchrest primer 28.5 grains H322 Sierra Prohunter 110gr

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Link Posted: 3/22/2007 4:59:20 AM EST
<center id=center>Put your AR-15 on steroids: 6.8mm SPC</center id=center>
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Link Posted: 3/22/2007 6:59:44 AM EST
Originally Posted By arteacher:
i176.photobucket.com/albums/w189/ar-15teacher/100_0532-1.jpg


This is a 5 shot group at 100 yards with a 1/9.5 Kotonics barrel.

<snip>quote]


Nice shootin Tex! What optic were/are you using? I read your answer to what load this was.
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Link Posted: 3/22/2007 12:18:38 PM EST

Originally Posted By southpaw67:
Originally Posted By arteacher:
i176.photobucket.com/albums/w189/ar-15teacher/100_0532-1.jpg


This is a 5 shot group at 100 yards with a 1/9.5 Kotonics barrel.

<snip>quote]


Nice shootin Tex! What optic were/are you using? I read your answer to what load this was.


The 6.8 has a Simmons Aetec 3x12 with the lit crosshairs. Most all of my pig hunting is at night and my old eyes can't see the crosshairs on the pig otherwise.

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