12 twist 308 ar barrels

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Why do you want a 12 twist? Plan on staying light?

I think Krieger has a 1:11 twist for around $500.
 
Isn’t standard twist for the .308 1-10”? Those will stabilize heavies like the 200 gr bullets, I’m also wondering why the slower twist is wanted?

Just a-wondering, that’s all :)

Stay safe.
 
Hmm, I’ve read where some folks like a slower twist for the .308 for lighter bullets. I’ve only owned one (Savage 99F) that research tells me has a 1-12” I believe. It shot ok, certainly not lights-out, so I never thought about the twist until you mentioned it.

Good luck with your search :thumbup:.

Stay safe.
 
Isn’t standard twist for the .308 1-10”? Those will stabilize heavies like the 200 gr bullets, I’m also wondering why the slower twist is wanted?
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The standard twist for 308 has always been 1:12. A 12 twist will handle most any hunting bullet 180 gr or lighter. It will even work with most 200 gr hunting bullets. It will do just fine with most 180 or lighter target bullets. The high BC bullets tend to be longer and if you want to shoot some of those 190 gr and heavier bullets a 10 twist might be a better idea.

But a 1:10 twist doesn't seem to be much of a handicap. In recent years many manufacturers have started to offer 10 twist 308's. FWIW I have 10,11, and 12 twist barrels. I shoot bullets 125-180 gr with equal accuracy from all of them. Unless you want to shoot something like 185-190 gr Bergers I think you'd be just fine with a 12 twist barrel and a 10 wouldn't be a handicap
 
jmr40 said:
The standard twist for 308 has always been 1:12. A 12 twist will handle most any hunting bullet 180 gr or lighter. It will even work with most 200 gr hunting bullets. It will do just fine with most 180 or lighter target bullets. The high BC bullets tend to be longer and if you want to shoot some of those 190 gr and heavier bullets a 10 twist might be a better idea.

But a 1:10 twist doesn't seem to be much of a handicap. In recent years many manufacturers have started to offer 10 twist 308's. FWIW I have 10,11, and 12 twist barrels. I shoot bullets 125-180 gr with equal accuracy from all of them. Unless you want to shoot something like 185-190 gr Bergers I think you'd be just fine with a 12 twist barrel and a 10 wouldn't be a handicap
Click to expand...
jmr40 said:
The standard twist for 308 has always been 1:12. A 12 twist will handle most any hunting bullet 180 gr or lighter. It will even work with most 200 gr hunting bullets. It will do just fine with most 180 or lighter target bullets. The high BC bullets tend to be longer and if you want to shoot some of those 190 gr and heavier bullets a 10 twist might be a better idea.

But a 1:10 twist doesn't seem to be much of a handicap. In recent years many manufacturers have started to offer 10 twist 308's. FWIW I have 10,11, and 12 twist barrels. I shoot bullets 125-180 gr with equal accuracy from all of them. Unless you want to shoot something like 185-190 gr Bergers I think you'd be just fine with a 12 twist barrel and a 10 wouldn't be a handicap[/QUOTI probably just need more practice.I am very new to the ar world,Iv shot bolt guns my whole life.I got a Diamondback db10 last year and I must say,it is a different world shooting an ar compared to bolt action.The recoil is just a different animal.I keep seeing about guns being over gassed,but I dont know how to tell if it is or not.
Click to expand...
 
If you’re shooting 150gr on up, the 1:10 should do you fine. 1:12 will do better for under 150 but I don’t think the handicap is worth it. Honestly, I’ve never shot under 150gr in .308. If I’m shooting close, I use a .223. It’s cheaper.

I’ve HEARD of light bullets tearing themselves apart from a 1:10.

As a practical matter, if your preferred flavor are the 150s and barrels are cheap, a 1:10 is likely your best bang for the buck.
 
I haven’t heard of a .308 Win blowing lighter 110-125 gr bullets up with a 1-10, but I have read articles stating a 1-7 / 1-9 or other fast-twist .224 bore will tear apart lightly constructed varmint bullets in .22-250 and .220 Swift-class speedsters.

I could also see it in a fast-twist .243 with 60 gr varmint bullets, those get cooking along, too.

But anything is surely possible.
Stay safe.
 
I’ve shot 110 gr Sierras in a Savage Model 10 PC (should be 1:10”) with great results. Never had any bullets come apart and groups were more than acceptable.
 
well I loaded some 168 gr hornady match bullets to m852 specs except I seated them to 2.829 and they shoot very good.I can live with the 10 twist barrel now,lol
 
You know, if your barrel is a 1:10 and it doesn't like the lighter bullets, it may not be the twist. It may just be your barrel. Mas Defense has a good deal on Ballistic Advantage barrels right now and they have a selection of AR-10 barrels. Like $150. That might be your ticket.
 
You can't turn a decently constructed 150 grs bullet "too fast" with 1:10 twist. M2 shot fine from the Garand, 147 grs ball shot fine from 1:10 twist M14s. And 155s are a staple with 1:10 twist bolt guns.

If you want a 1:12 twist barrel, by all means. But you don't need it to shoot 150s well.
 
I can't imagine how many hundreds (thousands?) of rounds of; 147, 151 or 155 I've shot through 1:10 to great results.

Todd.
 
The 168s are a good choice, glad you found something that your barrel likes :thumbup:.

That said I've shot numerous sub MOA groups using Hornady's .30 cal 150gr FMJ BT #3037. For an FMJ they are quite consistent and available to me at basically bulk prices so I usually have some on hand.
 
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