Quickdraw Limpsalot
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- Oct 14, 2004
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- 282
Uhh... my 700 SPS Stainless in .308 is 1:10 twist.
Remington offers 1:12 or 1:10, depending on the rifle.
Remington offers 1:12 or 1:10, depending on the rifle.
Twist Rate .308
- Thread starter 52grain
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With the .308 Win., here's the twist rates for various boattail match bullet weights giving best accuracy with max loads based on proper testing:
135 gr, 1:16
150 gr, 1:14
155 gr, 1:13
168 gr, 1:12
180 gr, 1:11.5
190 gr, 1: 11
200 gr, 1:10
220 gr, 1:9
240 gr, 1:8
Factory rifles typically have faster twists for all probable bullet weights that'll be used in them. This gives acceptable accuracy over a wide range of bullet weights.
135 gr, 1:16
150 gr, 1:14
155 gr, 1:13
168 gr, 1:12
180 gr, 1:11.5
190 gr, 1: 11
200 gr, 1:10
220 gr, 1:9
240 gr, 1:8
Factory rifles typically have faster twists for all probable bullet weights that'll be used in them. This gives acceptable accuracy over a wide range of bullet weights.
The_Hammer_Man
Member
There is also another very good reason why some of the more "vintage" battle rifles had 1 in 12" barrels.
Automatic fire....1 in 12"= extended barrel life. Kind of an important feature when you're a government trying to outfit 10,000 of your friends and neighbors aint it?
Lower bullet weight also meant lower levels of breakage and wear on the receivers and critical small parts during extended fire missions. Also meant you could pack a few more rounds into your jockies before "heading into the weeds".
Automatic fire....1 in 12"= extended barrel life. Kind of an important feature when you're a government trying to outfit 10,000 of your friends and neighbors aint it?
Lower bullet weight also meant lower levels of breakage and wear on the receivers and critical small parts during extended fire missions. Also meant you could pack a few more rounds into your jockies before "heading into the weeds".
roc1
Member
My Remington new ADL is 1-10 according to the factory
roc1
roc1
NWCP
Member
I originally thought my CZ550 FS was a 1:12. Then I kept coming across information stating they were 1:11.5 twist rates. All I know for certain is my CZ likes most ammo from 147 grain NATO surplus to 168 grain factory loads. If it's happy I'm happy.
dubbleA
Member
klineia said:
Yes, I believe Corbon offers it.
308 Twist
FWIW, My 'smith built me a Rem600 based medium range (300 yd) BR gun using a Kreiger 24" 12 twist tube. Now, I'm NOT a real good shooter, but this gun has me thinking that with a better scope I can compete with anyone at 100 or 600.
It was built specifically for the BIB 187 gr flat base bullet, and my first time out with it at 600 yds, I managed a 2.9" group in a variable wind. (Like I said, not the best shooter, but ok for 1st time at 600yds and only a 24x scope.)
Check out the Ballistic Idiot's site; he lists the optimum twist rates for his bullets. I'm using the 155 flat base at 100 yards, since it is a lot easier on the old shoulder, and it seems a tad better for 100. Both are 10 ogive designs.
FWIW, My 'smith built me a Rem600 based medium range (300 yd) BR gun using a Kreiger 24" 12 twist tube. Now, I'm NOT a real good shooter, but this gun has me thinking that with a better scope I can compete with anyone at 100 or 600.
It was built specifically for the BIB 187 gr flat base bullet, and my first time out with it at 600 yds, I managed a 2.9" group in a variable wind. (Like I said, not the best shooter, but ok for 1st time at 600yds and only a 24x scope.)
Check out the Ballistic Idiot's site; he lists the optimum twist rates for his bullets. I'm using the 155 flat base at 100 yards, since it is a lot easier on the old shoulder, and it seems a tad better for 100. Both are 10 ogive designs.
Boba Fett
Member
Just because a round can reach out to X distance and some highly trained expert sniper with thousands of dollars of equipment and an extra guy spotting for him made the shot one time doesn't mean that we rewrite the books on what to expect from a caliber. Consistency is key in determining a rounds effective range.
People aren't saying the 308 can't go past 800 yards, but that it doesn't perform as constantly past that range.
http://www.snipercentral.com/308.htm
ricehombre
Member
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- Oct 25, 2005
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- 53
Don't forget the twist requirements are related to bullet length and not weight. Your all copper bullets and some long range pointed bullets are going to require a faster twist than the same weight standard jacketed bullet. On the other hand, sometimes you can get by with a slower twist if you use a round nose or semi-spitzer style heavy bullet.
Rob96
Member
Didn't say it is the new standard. Just saying that in the right hands, the weapon is capable.
glazer1972
Member
1:10 would be my preference.
NCdrummer
Member
.308
I'll follow the USAMU standard of 1:11.25 used in the M24. I have the civilian version Remington 700SS 5R .308 and it really shoots. Anything from 150 grain Noslers to 175 grain Sierras will group in one ragged hole at 100 yards. Different points of impact obviously, but they all group well. At Eglin AFB Commander's private pig/deer hunt last weekend I shot a beautiful 8-point buck at 416 yards, lasered and verified by FWC guys. Load was Nosler AccuBond 165 over 47 grains RE15. It's a very accurate rifle!
I'll follow the USAMU standard of 1:11.25 used in the M24. I have the civilian version Remington 700SS 5R .308 and it really shoots. Anything from 150 grain Noslers to 175 grain Sierras will group in one ragged hole at 100 yards. Different points of impact obviously, but they all group well. At Eglin AFB Commander's private pig/deer hunt last weekend I shot a beautiful 8-point buck at 416 yards, lasered and verified by FWC guys. Load was Nosler AccuBond 165 over 47 grains RE15. It's a very accurate rifle!
I should mention, the smith who built it was Bill Shehane. He deserves the bulk of the credit for building a good shootin rig. In all honesty, I never thought about that group being under a half-minute. But even my worst group was just over a MOA; with a nasty flier from a missed wind change. Most everyone else there seemed a bit better!
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I have a Win 70 Stealth with 1:12 twist. I have no complaints but I also limit the gun to 168 gr bullets. My opinion is the .308 was not meant for heavier stuff as the velocity really falls off when you start talking about 180 gr bullets.
Also see a lot of the long range .308 shooters using the 1:12 twist.
Also see a lot of the long range .308 shooters using the 1:12 twist.
Joed says:
The military teams using converted Garands with 7.62 NATO chambered 24-inch 1:12 twist barrels shot 190-gr. match bullets with max loads. Virtually as accurate as bolt action match rifles, they often out-shot the M14's lots of times with those 190's the M14 couldn't use.
One can use heavy bullets in a .308 Win. case with 1:12 twists.
When the M14 was the service rifle used by some military teams winning matches and setting records, they oft times used 180-gr. match bullets in those 22-inch 1:12 twist barrels. Yes, maximum loads were needed but they remained supersonic all the way through paper at 1000 yards.
The military teams using converted Garands with 7.62 NATO chambered 24-inch 1:12 twist barrels shot 190-gr. match bullets with max loads. Virtually as accurate as bolt action match rifles, they often out-shot the M14's lots of times with those 190's the M14 couldn't use.
One can use heavy bullets in a .308 Win. case with 1:12 twists.
Zak Smith
Member
My 24" 1:12 shoots 155's up to 190's just fine. Lapua has a 155gr factory load obviously.
My load of choice is a 155gr Scenar at about 2925 fps using Varget. It's as good as anything in .308 to 1000 yards.
My load of choice is a 155gr Scenar at about 2925 fps using Varget. It's as good as anything in .308 to 1000 yards.
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