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223 rifle twist rates

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Topic: 223 rifle twist rates
Posted By: stork23raz
Subject: 223 rifle twist rates
Date Posted: June/17/2010 at 11:05

I see 223 AR's with twist rates form 1:9, 1:8, and 1:7. I know its for different bullet weights. So why are all the bolt guns I see just 1:9? Can you still stablizie a heavy bullet in one of these?



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And fear not them which kill the body, but are not able to kill the soul: but rather fear him which is able to destroy both soul and body in hell.

Matthew 10:28



Replies:
Posted By: supertool73
Date Posted: June/17/2010 at 11:11
Savage makes a few models with 1-7" twist so it will shoot the heavier pills better.

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Lifetime warranty and excellent customer service don't mean a thing when your gun fails during a zombie attack.

"A Liberal is a person who will give away everything they don't own."


Posted By: supertool73
Date Posted: June/17/2010 at 11:14
I have not had much luck shooting over 68s in a 1-9" twist.  My 1-7"s shoot the hornady 75s amazingly well though.

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Lifetime warranty and excellent customer service don't mean a thing when your gun fails during a zombie attack.

"A Liberal is a person who will give away everything they don't own."


Posted By: stork23raz
Date Posted: June/17/2010 at 11:20

It just seems odd. almost every ar company makes models in 1:9 or 1:8 at least. why dont bolt manufactures do the same. Cause I think they should.

I think I seen the savage ones iwth a 1:7 arentt those competition guns. Do you know of any that more hunter or tactical rather than big shiny 30" guns?



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And fear not them which kill the body, but are not able to kill the soul: but rather fear him which is able to destroy both soul and body in hell.

Matthew 10:28


Posted By: SVT_Tactical
Date Posted: June/17/2010 at 11:21
I've never been able to get heavier bullets to shoot in an AR because of loading them to mag length.  highest I use now is 69.  Each gun is a little different and where some 1:9 may shoot 75gr's others won't

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"Most folks are about as happy as they make their minds up to be" - Abraham Lincoln


Posted By: SVT_Tactical
Date Posted: June/17/2010 at 11:22
Bud has a thumbhole savage with a 7 and I will have on one Sunday with a 7 too.  they are the model 12 savage thumbhole laminate bull barrel.

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"Most folks are about as happy as they make their minds up to be" - Abraham Lincoln


Posted By: supertool73
Date Posted: June/17/2010 at 11:29
Originally posted by stork23raz stork23raz wrote:

It just seems odd. almost every ar company makes models in 1:9 or 1:8 at least. why dont bolt manufactures do the same. Cause I think they should.?



I would say because 95% of the ammo people shoot is either military ball ammo (62 grain) or regular old 55 grain FMJ.  People who need the heavier bullets typically are shooting target or competition so they have specialized guns built anyway.  Plus the .223 is mostly a varimint round so there is no need for a heavy bullet.  And a 1-9" shoots pretty much 45- 69 grain quite well which allows a pretty big versatility for shooters.


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Lifetime warranty and excellent customer service don't mean a thing when your gun fails during a zombie attack.

"A Liberal is a person who will give away everything they don't own."


Posted By: stork23raz
Date Posted: June/17/2010 at 11:31
I shot some hornady 75s in my 1:9 are jammed trying to load almost every , or every other round.  Mines set  for 60's now and no probelms. I mainly just have rimfire's and shotguns mostly. only centerfire I got is  ar & ak. But there is just someting I like about the 223 I know its not a elephant slayer and not the best varmint round but it just seems coool to me. every thing from the 40s up the 77s.  seems very veristile in its abilities. I know the Ar's have made it a very popular round just wondered why at least different barrel twist havent become as common in bolt guns.

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And fear not them which kill the body, but are not able to kill the soul: but rather fear him which is able to destroy both soul and body in hell.

Matthew 10:28


Posted By: SVT_Tactical
Date Posted: June/17/2010 at 11:39

223 is being held alive by the AR..... there are too many other calipers superior. IMO



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"Most folks are about as happy as they make their minds up to be" - Abraham Lincoln


Posted By: shooter07
Date Posted: June/17/2010 at 11:43
I have a BCM 16" mid-length with a 1:7 twist. It LOVES Hornady BTHP and TAP 75gr. The 1:7 twists will generally be more accurate with the 60+gr loads.

The korean made 5.56 winchester Q3131A1 is my bulk ammo. It's not Hornady or Black Hills but than again it doesn't cost 18-19 a box.




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Si Vis Pacem Para Bellum

"Issac Newton invented gravity because some asshole hit him with an apple"
-Chris Moltisanti


Posted By: stork23raz
Date Posted: June/17/2010 at 12:00
Originally posted by SVT_Tactical SVT_Tactical wrote:

223 is being held alive by the AR..... there are too many other calipers superior. IMO

 
Oh i know its def not the best. i think it is a neat little round. I personally would like to have a 6.5G &/or 6.5C but i dunno they will ever become popular enough.
 
as far as the 223's in ar. its a  military caliber so it will be around for along time.  I personally think our soldiers should be carrying 6.8 or 6.5


-------------
And fear not them which kill the body, but are not able to kill the soul: but rather fear him which is able to destroy both soul and body in hell.

Matthew 10:28


Posted By: supertool73
Date Posted: June/17/2010 at 12:03
That is what is nice about reloading.  As long as you can get the brass it does not really matter if the caliber is popular or not.  

-------------
Lifetime warranty and excellent customer service don't mean a thing when your gun fails during a zombie attack.

"A Liberal is a person who will give away everything they don't own."


Posted By: SVT_Tactical
Date Posted: June/17/2010 at 13:08
Dont' get me wrong I love the 223, just got another.  put if i where gonna get into p-doggin' and such, i would want a 204 or 22-250. 

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"Most folks are about as happy as they make their minds up to be" - Abraham Lincoln


Posted By: stork23raz
Date Posted: June/17/2010 at 13:21
oh yea 223 doest have the shear velocity to compete.
I hope to take my ar out in the woods with its 60 grainers see if i can find some unsuspecting deer to shoot.
SVT-I know how much you enjoy headshotting deers.


-------------
And fear not them which kill the body, but are not able to kill the soul: but rather fear him which is able to destroy both soul and body in hell.

Matthew 10:28


Posted By: Teddy Bear
Date Posted: June/17/2010 at 15:57
My 223wssm has a 10 twist.  But only available factory loads are 55 and 64.  If I don't start doing my own reloading I may have to trade it for a 22 250 if and when ammo becomes scarce.  Probably why I got such a great price on the rifle in the first place, because they stopped making them.

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"Never rub another man's rhubarb!!"


Posted By: cheaptrick
Date Posted: June/18/2010 at 16:09
Originally posted by shooter07 shooter07 wrote:

I have a BCM 16" mid-length with a 1:7 twist. It LOVES Hornady BTHP and TAP 75gr.
 
I have the same upper.
My Bravo doesn't like 75gr. TAP ammo. Likes the Georgia Arms 68gr atuff and my 69gr reloads.  


Posted By: coyote95
Date Posted: June/18/2010 at 18:18
                                                      
this is a recent group shot @ 100yrds  1:8 twist with Black Hills 69gr sierra match king hp  the gun also shoots 55gr and 65gr about the same.


Posted By: Mike McDonald
Date Posted: June/18/2010 at 18:18
I have one of the Savage 12 LRPV models, 1:7 twist with 26 inch tube.
Launches 80 grain sierra's at 2900 fps.  Last comp was 20 into 3/4 moa at 300 yards prone according to the score card.. 
Takes about 31.75 moa to 1000.


Posted By: Dakotaman
Date Posted: January/21/2012 at 00:10
My 1:9 AR shoots Hornady 75g just fine. I predict that the bolt rifle manufactures will soon provide other twist options just like the AR manufacturers do. There are too many good heavy bullets in that caliber now to avoid. Most bolt guns in .223, .22-250, etc. have been bought by varmint hunters who want speed. Therefore they are shooting 40-55 grain bullets. Once they discover just how accurate those big bullets are at 600 yards and beyond, they will step up to the challenge. The 1:7 twist will take a little velocity off of those little bullets but they will allow varmint hunters and target shooters to shoot very accurately out to 1000 yards by stabilizing those heavy bullets.
 


Posted By: Stevey Ducks
Date Posted: January/26/2012 at 01:18
I have a 1-9 twist .22-.250 and use 68 Hornady hpbt's with H4350 powder with really good results up to 500 yds and more. I had to see if the 75 gr. AMaxes would shoot in the 1-9 twist .22-.250 but they would not. I also shoot the 53 gr. VMax (.5 groups @ 100) because they are speedy. Possibly all 1-9 twist barrels are not the same as the rifling buttons may differ from barrel to barrel. 
 
My .223 bolt gun at more than 250 fps slower with a 1-9 twist shoots 40's, to 68's really well. Brass is cheap, small powder charges, and long barrel life.
 
My next .22-.250 will have a 1-8 twist to shoot the 75 gr AMax's. I have no plans to shoot 40 gr VMaxes in that rifle. I hear that 1-14 twist barrels will not shoot 53 VMax's well but the 1-8 should. 


Posted By: Dakotaman
Date Posted: January/26/2012 at 08:02
Stevey, I can't stabilize the 75g Amax bullets in my 1:9 either but I CAN stabilize the 75g Hornady Match HPBT... these bullets are very accurate with RL15 for me. You might want to try them for 600 yard varmints. I used to shoot little 45g .220 Swift bullets for blazing speed (4100 fps). After popping tons of p-dogs at 250 yards, I now much prefer to target them at 500-600 yards, even out to 1000 yards. It is just a lot more fun and more of a challenge. With the fantastic optics and barrels available today, this is very achievable for most hunters. If you try them, look at 500 yard groups rather than 100 yard groups because any heavy-for-caliber boat tail bullet will fish tail for the first 200 yards. They straighten out real nice at about 300 yards though and typically shoot better 600 yard groups than the small bullets by far. Plus they buck the wind real consistently. Now I would gladly sacrifice a few hundred fps of speed in the little bullets to get the hunting effectiveness of these big bullets. Especially if you need to deer hunt with them too.


Posted By: Stevey Ducks
Date Posted: February/06/2012 at 23:40
Thanks DMan,
 
Just trying to avoid another partial box of 75-80 bullets waiting for another barrel to shoot them through. Have gone there with 142 gr MK's in a 1-9 6.5mm.
 
The 75 gr hpbt's should be just as effective or more on coyotes as the 68's are.


Posted By: lumberjack149
Date Posted: February/07/2012 at 06:09
Originally posted by Dakotaman Dakotaman wrote:

If you try them, look at 500 yard groups rather than 100 yard groups because any heavy-for-caliber boat tail bullet will fish tail for the first 200 yards. They straighten out real nice at about 300 yards though.
  
Have you personally seen this or is this something you read on the internet and assumed it had to be true? Have you shot these bullet at paper at 50/100/etc. yards and seen oblong holes?
The only thing that matters is you have a proper twist in your barrel to stabilize the bullet you select. If this is met, then there should be no stability problems at any distance. If you are truly seeing "fish tailing" or wobbling of any sort, then you need to select a different bullet.
The stability factor can be determined pretty accurately by math if you know your barrel twist and bullet length.


Posted By: Stevey Ducks
Date Posted: February/07/2012 at 13:04
In regard to shooting long bullets in a rifle with not enough twist - what I have seen is this:
 
Sideways bullet holes at 100 yds then no predicable strikes beyond 100.
or
Very poor groups, like 3-4 inches but no profiled bullet holes.
or
Not much difference in 100 to 200 to 300 yd groups - like a 1 moa group at 100 is a .75 moa group at 200
 
Other observations are that is easier to get shorter bullets to group better at shorter ranges than longer bullets. ie. 52 gr. .224's, 68-70 gr. 243's, 130 gr. .308's all shot with slow twist rifles..
 
I think the term used for long bullets is "going to sleep" and that claim is valid. On page 1060 of edition V of the Sierra manual bullet "yaw" is discussed - "First as described in section 2.4, a bullet exits the muzzle with some ballistic yaw generally an angle on the order of one degree. This initial yaw causes the bullet to precess, or cone about the velocity vector. As the bullet flies, this coning motion dampens out or damps out to some minimum value over the first 200 yards or so." The manual goes on to state that small effects that become more apparent during an extended time of flight are "overwhelmed by the coning motion at short ranges". On page 1063 of the same manual appears a diagram, Figure 4.2-1 showing a bullet with a: center of mass, center of pressure, and "yaw of repose". My belief is that the distance "r" between the center of mass and the center of pressure would be greater on a longer bullet resulting in a greater "yaw of repose". Slowing the rate of twist at some point would result in insabilty resulting in poor or no (sideways) accuracy. Remember preschool play time with toy gyroscopes - when the were pushed in one direction they moved at right angles, 90 degrees to the direction they were pushed, that is "precess".
 
What I think is that I need a 1-8 twist to launch the 75 gr AMax out of a .22-.250 and tiny groups at 100 yds are secondary to accuracy at 500 yds and more. I also would prefer the AMax over a OPM bullet because I think the expansion would be better. The Sierra Infinity program tells me a .22-.250 shooting 75-77 grain projectiles would be a very cost effective varmint killer at long ranges.  Until I get the 1-8 I plan to try and then shoot 75 OPM's in my 1-9.
 
In my former life I have been chewed out for failure to "RYFM". 


Posted By: lumberjack149
Date Posted: February/07/2012 at 15:21
not sure what RYFM stands for?

Thanks for the reply seems like youre well read, not sure on your shooting back ground. I guess maybe i should clarify my post. I agree with you on almost everything you said above, my point is the significance people are giving it (including yourself).

Do you consistantly shoot better MOA at 200yds vs. 100yds with low drag bullets? I dont in any of my guns. We have all seen plenty of rifles shoot one hole groups with boat tail bullets at 100yds, how come they didnt experience this going to sleep? If you do experience this going to sleep, does this difference go away with flat base bullets in your rifle?
 
All the below is based on reading Bryan Litz book Applied Ballistics For Long Range Shooting, its a great read i recommend it to everybody.
 
The Yaw vs. Pitch that makes up the epicylic swerve (corkscrew flight path) - this would be worse at 3-5yds (makes sense, he was quoting a worse case of 0.04" and goes away quicker with a faster twist) and by the time the bullet has traveled to 100yds the swerve radius has shrunk to an immeasurable amount and is far dwarfed by other factors.
 
As far as its easier to get shorter bullets to group better at shorter ranges - This is correct to a point b/c low drag bullet/boat tails are inherently less precise than flat base bullets b/c of the more complicated bullet design, muzzle blast on boat tails, etc. With modern manufacturing these differences are very small (most of use dont shoot that good) and the low drag wins out down range (we both agree on that). When getting down to the niddy gritty, a slowest twist barrel that is able to stabilize the bullet should be more accurate than a faster twist one since the faster twist magnifies the imperfections of the bullet (like driving a car with a tire out of balance, its gets worse the faster you go), but once again with modern manufacturing of bullets this should be nil.


Posted By: Stevey Ducks
Date Posted: February/07/2012 at 20:58
Let me put it this way - if I wanted to shoot the very smallest groups at 100 yds I would use shorter bullets with slower twist rates. Like 1-14 with 50 gr in the .22-.250. I have shot one hole groups with 68 Hornady OPM (a boat tail) in my 1-9 twist .22-250.
 
My guess as far as the bullet "sleeping" factor is that is a function of bullet length vs just having a boat tail - many bullets intended for bench rest are light for caliber and have boat tails - the .224 52 gr Sierra hpbt, .243 70 gr Sierra hpbt are some. These are extremely well made bullets having precisely formed bases. Generally,  yes, I can shoot better groups at 100 yds with lighter bullets than long heavy bullets 52 gr. .224's and 168  gr .308's are some.
 
Experience in getting 140gr Hornady SST's to shoot well in my 1-8 twist 6.5-06 has been frustrating as the best that I can do is 1.5 MOA at 100 yet this load shoots very well at 500 yds and beyond. The same rifle shoots the 100 gr HAMax into a .3 clover leaf but does not do as well in the wind at extended ranges. Some time ago I saw a .264 Win mag shoot a sub .5 group at 100 with a flat base 140 grain and using the right combination of components in another rifle the 140 .264 SST would probably do better than in my rifle.
 
As I write all of this I can imagine lots of readers pulling out tiny groups shot at 100 yds with long skinny bullets so any bullet coning induced by precession was not a factor for accuracy in that case or that the shooter just lucked out in firing a 3 shot group where a bad shot just happened to land right.
 
Importance for me - some time ago it seemed that I could nail every rockchuck in sight with a 6.5-06 loaded with the 140 gr SiMK at really long ranges with some shots more then 700 yds. When I got around to testing my precise neck turned powder weighed loads I was disappointed to see 1.5 inch groups at 100. I stepped down to the Sierra 120 gr OPM and FB and my scores decreased but 100 yd accuracy was improved. At the same time I was shooting HI Power with the .308 Win loaded with 168's up to 600 yds and it was no contest under 200 yds as the .308 Win easily out shot the 6.5-06.
 
If I had lots of stuff to play around with I would calculate the B.C at 200. Then using velocity differences between 200 and 400 calculate the B.C. again. Any bullet "coning"  can only have bad effects on B.C. as the bullet is not flying point on.
 
I approach shooting just like other things and I have read the Sierra manual thus for me "read your ------- manual" - RYFM before I go out and start some project.
 
Add Bryan Litz along with 75 gr .224 bullets.


Posted By: Stevey Ducks
Date Posted: February/08/2012 at 21:38
On the coning.
 
Two items from Sierra - 4.6 Ballistic Coefficients Dependence on Coning and 4.0 Six Degree of Freedom Effects on Bullet - Exterior Ballistics.
 
One item from Brian Litz, http://www.appliedballisticsllc.com" rel="nofollow - www.appliedballisticsllc.com
 
For the Sierra items an analysis was presented using the 190 Sierra MK fired from rifles having various twist rates. A conclusion was reached that bullet coning was a fact and that B.C.'s were changed by various twist rates. 
 
The Brian Litz item was much more informative especially the youtube presentation of the "epicyclic swerve" at various ranges where swirly traces eventually formed a compact spot. Brian Litz then went on to say, "The phenomenom of smaller angular groups at longer ranges was not disproven only that I (Brian Litz) have shown that if the phenomenom actually happens epicyclic swerve is not the cause of it." At the start of his discussion Brian Litz does mention short range vs long range accuracy.
 
A discussion of muzzle blast/gasses also was included along with boat tail bullets - moderate velocities for the best accuracy. 
 
A comparison of .308 diameter bullets with other calibers for long range was included. This probably explains why 6.5 and 7mm bullets are becoming more popular.
 
When I start shooting my 75 - 80 gr. 224's I will look for eliptical holes in my target paper and take another look at short vs long range MOA accuracy. If I had to shoot in a 100 yd or 200 yd bench rest match I would prefer a light bullet with a slow twist at a moderate velocity doubting a long slender bullet with a fast twist would be the best choice. But do long slender bullets shoot better at long ranges only because they don't follow the wind as much? Do B.C.'s become more uniform as the "epicyclic swerve" decreases?
 
Brian Litz is a real smart guy in addition to being a champ shooter.
 


Posted By: lumberjack149
Date Posted: February/09/2012 at 06:48
Originally posted by Stevey Ducks Stevey Ducks wrote:

  http://www.appliedballisticsllc.com" rel="nofollow - www.appliedballisticsllc.com
 Brian Litz is a real smart guy in addition to being a champ shooter.

ya he is, I know i enjoyed reading his book. Another thing in his book that was handy is his field measured BC of many different bullets vs. what is advertised. Ill even loan you my book if youre a quick reader but it will end up being one of those you want to buy for future reference.


Posted By: RotoReuter_DM
Date Posted: February/09/2012 at 21:30
I have a LMT cqb 16 piston AR 5.56 and i was shooting some crap ammo out of it and couldnt even zero the Optisan Mamba i just purchased from SWFA. I went to the store and got a better box of ammo but still 55 gr. The gun has a 1in7 twist... Any suggestions on factory ammo that will shoot better. I'm hoping it isnt the scope! The groups got a lot better with the Federal surplus 223 than it was shooting with herters... haha I want to start running decent ammo through it since i dont shoot it as often as i figured i would and i think its a pretty nice rig... 

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Old Mil ftw


Posted By: jehu
Date Posted: February/10/2012 at 06:44
Best results from a 223 55gr and under get the old 1:12 twist. If you want to shoot heavier bullets move to 1:9,8,or7 twist. I shoot alot of GH's and use a Sako Deluxe Vixen and a Weatherby Super Preadator Master useing Hornady V-Max 55gr, both are 1:12 twist, and they are tack drivers. Bought a Tika T3 stainless lite 1:8 and could not get a good group with 55gr.


Posted By: Urimaginaryfrnd
Date Posted: February/10/2012 at 06:51

Tikka makes two different twist rates for .223 one is the 1 in 8 which likes 75 gr BTHP.

If you look in the Horniday reloading manual the .223 loads end at the 60 gr AMAX. The 5.56mm Service rifle loads show the heavier bullets.  The .223 was originally designed as a varmit caliber adequate  to shoot a 17 lb animal at 100 yds.  The high capacity magazines of the AR guns have made them popular with the lets make noise crowd most of whome fail to aim adequately.



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"Always do the right thing, just because it is the right thing to do".
Bobby Paul Doherty
Texas Ranger


Posted By: RotoReuter_DM
Date Posted: February/10/2012 at 08:29
Ill try some heavier bullets! It has a 1 in 7 and I'm not gonna buy a new barrel! Thanks for the info gents

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Old Mil ftw


Posted By: SVT_Tactical
Date Posted: February/10/2012 at 08:36
try to find some black hills loaded with 69grs.


Posted By: RotoReuter_DM
Date Posted: February/10/2012 at 09:15
Sounds good ill probly buy a couple different boxes try and find out what works. The gun should shoot about 1.5 MOA from what people say on average some getting better results. I'm liking the little Mamba scope. Thanks to your review SVT

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Old Mil ftw


Posted By: SVT_Tactical
Date Posted: February/10/2012 at 09:59
glad its working out for you


Posted By: supertool73
Date Posted: February/10/2012 at 12:28
With the 1-7 you should shoot 62 grain or heavier.  I have had 3 different 1-7s and none of them would shoot the 55s worth a darn.  They shot the 62s okay, the 69 and 75s are excellent.  

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Lifetime warranty and excellent customer service don't mean a thing when your gun fails during a zombie attack.

"A Liberal is a person who will give away everything they don't own."


Posted By: RotoReuter_DM
Date Posted: February/10/2012 at 12:55
Thanks Tool i appreciate it! Definately be buying some heavier stuff real soon!

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Old Mil ftw


Posted By: SSJet
Date Posted: February/20/2012 at 21:38
Shooting Times has an article in the April 2012 issue about .223 accuracy, twist rates and bullet weights. Basically: 1) As a general rule, the longer bullets need the faster twist rates and your longer bullets are usually heavier, and 2) there are exceptions to general rules.


Posted By: Tip69
Date Posted: February/21/2012 at 09:05
I read that article too Jet.... interesting I thought.

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take em!


Posted By: Urimaginaryfrnd
Date Posted: February/21/2012 at 10:17

BULLET WEIGHT / CALIBER / TWIST RATE CHART

Grain/Cal.172.204.224.243.257.264.277.284.308.338.358
17-209-10
2510
30912
33 12
35 12
37 VLD6
40 12
50-52 914
55 12
60 12
68-69 9,1013,14
75 9 14
80 8
85 7121212
90 710
100 1010 1214
105-107 8
120 1010 1215,16
130 10 14
140 91010
150 14
140-160 8101012,13
150-168 911,12,13
150-180 10,11,12
160 9
175 9
180 10,11,12
200 10,1110,1212,16
220 10
225 10,1212,16
240-250 101012
300 1012


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"Always do the right thing, just because it is the right thing to do".
Bobby Paul Doherty
Texas Ranger


Posted By: Glock
Date Posted: February/23/2012 at 06:32
Sako actually offer their 223 Rem with two twist rates a 1 in 8 and a 1 in 12, so at least some of the manufactures are listening to shooters needs. Makes sense if you have an AR platform and want to use the same bullet weights in both bolt and semi auto.

Regards Chris


Posted By: BWM
Date Posted: September/18/2013 at 11:56
There is a lot of 223 guns that have 1-9 and 1-8 and target rifles with 1-7 


Posted By: BWM
Date Posted: September/18/2013 at 12:01
The 223 came for the the police action in Non around 61 That was the first 223.


Posted By: BWM
Date Posted: September/18/2013 at 12:53
Savage Colt Rock River Arma Lite Bush master DPMS S&W and a few more has different twits.


Posted By: JD548
Date Posted: September/19/2013 at 09:28
to add to the confusion -- many 1-9" barrels are actually 1-8.5" or 1-8.77"

generally i haven't had any accuracy problems with the 1-7" barrels other than going from 75/77gr to 55 i get a POI shift .


some barrels like one load over another too.

my 20" barrels in 9" twist  /actually 1-8.5"s seem to love 77/75/69gr hornady match bullets--

when i load m855 military ammo accuracy drops due to the bullet being steel cored and or not being as uniform in shape.

length also plays a part a 24" 1-9" may well stable  and be accurate with 77gr loads , drop back to a 16" and you may see some tumbles--

generally a 1-9" gives you the widest possible range of bullets it will work with and that is why most barrels are 1-9"

if your going to run a lot of long bullets like 77grs go to a 1-8".




Posted By: RifleDude
Date Posted: September/19/2013 at 12:41
I would always prefer "too fast" a twist than too slow. With the better bullets available today, you don't generally see accuracy suffer by using light (short) bullets in a fast twist tube optimal for the heavier bullets, though the opposite isn't true. You don't run into problems by over-stabilizing a light bullet if said bullet is precisely made and well-balanced to begin with. In other words, if you're using bullets with a reputation for consistency and good accuracy to begin with, you won't go wrong in selecting the faster twist for that bore size, and you'll be able to use a wider selection of bullet weights and styles.

The twist rate rules apply more toward ensuring that you have adequate twist for the "long for caliber" bullets rather than being conservative with twist for the lighter, "short for caliber" bullets. I've seen plenty of fast twist barrels shoot light bullets very well, but not vice-versa.


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Ted


Money can't buy happiness... but it's much more comfortable to cry in a Porsche than on a bicycle.



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