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barrel twist rate, ar15 ?

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michiganman View Drop Down
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    Posted: February/23/2011 at 11:05

can anyone help me out with barrel twist rate. I always had a hardtime under standing this area.I'm setting up my rock river lar-15 (223) for target/varmit matches ,so im getting ready to buy a new barrel. the one i have my eye on is a rock rivers varmit (bull barrel ,stainless) in ether 20 or 24"

the varmit matches shoot up to 300y and now my ? what are these twist rate's  good for and what grain bullet is best for what rate
1:8
1:9-
1:12-
 
thanks for the help
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Post Options Post Options   Thanks (0) Thanks(0)   Quote supertool73 Quote  Post ReplyReply Direct Link To This Post Posted: February/23/2011 at 11:07
1-8 80-55ish
1-9 69-50ish
1-12 55-40ish
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Midwest_Hunter Quote  Post ReplyReply Direct Link To This Post Posted: February/23/2011 at 11:15
A basic explanation of barrel twist rates is, the heavier the projectile, the faster the twist you need.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote pyro6999 Quote  Post ReplyReply Direct Link To This Post Posted: February/23/2011 at 12:57
i was told once that you can never over spin a bullet.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bigdaddy0381 Quote  Post ReplyReply Direct Link To This Post Posted: February/23/2011 at 13:01
Originally posted by pyro6999 pyro6999 wrote:

i was told once that you can never over spin a bullet.
 
Thats B.S. 
a 30somthing gr var grenade will not shoot out of a 1-7 twist 22-250. they hit like buckshot even at 20 yards.
 
 
 


Edited by Bigdaddy0381 - February/23/2011 at 13:02
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bigdaddy0381 Quote  Post ReplyReply Direct Link To This Post Posted: February/23/2011 at 13:01
I think urimafrnd posted a chart awahile back. would be a good sticky. if someone finds it.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Sparky Quote  Post ReplyReply Direct Link To This Post Posted: February/23/2011 at 13:03
I have a Rock River Varmint in both 16 and 24 inch barrels with a 1:8 twist. Mine seem to like the 69gn SMKs best. I had asked Rock River what weight worked best in the 1:8 and their reply was 68 to 72gn.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote pyro6999 Quote  Post ReplyReply Direct Link To This Post Posted: February/23/2011 at 13:05
Originally posted by Bigdaddy0381 Bigdaddy0381 wrote:

Originally posted by pyro6999 pyro6999 wrote:

i was told once that you can never over spin a bullet.
 
Thats B.S. 
a 30somthing gr var grenade will not shoot out of a 1-7 twist 22-250. they hit like buckshot even at 20 yards.
 
 
 

at what speed?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bigdaddy0381 Quote  Post ReplyReply Direct Link To This Post Posted: February/23/2011 at 13:09
Originally posted by pyro6999 pyro6999 wrote:

Originally posted by Bigdaddy0381 Bigdaddy0381 wrote:

Originally posted by pyro6999 pyro6999 wrote:

i was told once that you can never over spin a bullet.
 
Thats B.S. 
a 30somthing gr var grenade will not shoot out of a 1-7 twist 22-250. they hit like buckshot even at 20 yards.
 
 
 

at what speed?
 
all speeds, from the test and things I have done with them. Its the heat that makes them come apart something about the inside melting. I went 4 gr below min and it still did it. went 3 gr about and it still splated them.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote pyro6999 Quote  Post ReplyReply Direct Link To This Post Posted: February/23/2011 at 13:13
 a 30-something grain bullet in a 22-250 is just asking for trouble.thats like shooting a 90gr bullet out of a .300mag


Edited by pyro6999 - February/23/2011 at 13:13
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bigdaddy0381 Quote  Post ReplyReply Direct Link To This Post Posted: February/23/2011 at 13:19
I agree but you can over spen them just like you can under spin one. Like my 243 with the 105gr berger. they hit side ways.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote pyro6999 Quote  Post ReplyReply Direct Link To This Post Posted: February/23/2011 at 13:23
ok im on board with you, im just saying i heard somebody say it. i didnt necessarily agree, i was just on a sight reading a little, and they said that in general the slowest twist you can use is the best (for accuracy) at least in the competition world. i usually try to match bullet weights in my guns by using the heaviest bullet with the most accuracy. in .224 45-55gr bullets have been very reliable for me.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bigdaddy0381 Quote  Post ReplyReply Direct Link To This Post Posted: February/23/2011 at 13:26
in my .224 69gr and 70gr work best for the faster twist.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote pyro6999 Quote  Post ReplyReply Direct Link To This Post Posted: February/23/2011 at 13:29
Originally posted by Bigdaddy0381 Bigdaddy0381 wrote:

in my .224 69gr and 70gr work best for the faster twist.

if your using a 1:7 then it should, my .22-250 is old and its got either a 1:12 or 1:14 twist which isnt good for anything that heavy.Bucky
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Post Options Post Options   Thanks (0) Thanks(0)   Quote supertool73 Quote  Post ReplyReply Direct Link To This Post Posted: February/23/2011 at 14:56
My 1-7s don't like anything under 68 very well.  At 50 yards with 62 I only get like 2 inch groups.  With 75s I can get .5 inch at 100 yards.  Its crazy the difference it makes.  
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BeltFed Quote  Post ReplyReply Direct Link To This Post Posted: February/23/2011 at 15:13
Just to be the fly in the ointment. I tried 2 AR barrels from the same manufacturer with the same profile and both are 1 in 8" twist. One barrel likes 62 to 69gr bullits, the other will only shoot 77gr bullits worth a darn.Loco
The 1 in 9" twist barrels i've tried, shot both 55 and 62gr bullits well, but prefered the 62gr bullits. This is expected for the most part, but I was supprised by the 1 in 8" twist results. I also tried a 1 in 7" twist barrel on a Styer Aug, and it did better with 62gr bullits than one of the 1 in 8" twist barrels with 62 or 69gr bullits.Whacko
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Post Options Post Options   Thanks (0) Thanks(0)   Quote supertool73 Quote  Post ReplyReply Direct Link To This Post Posted: February/23/2011 at 15:19
I guess that goes to show us, you never really know what will work best til you try a bunch of them.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote stickbow46 Quote  Post ReplyReply Direct Link To This Post Posted: February/23/2011 at 17:46
I agree  with the school of thought that the heavier the bullet the faster the twist rate.I do have 2 rifles that do change my logic.700 rem police in .223 ..1:9 twist that shoots best when using .75grn Hornady V max[just defies my logic]but it is dead on out to 300 yds.
 
The other rifle is my Rem 5R in .308 [11.25 twist]which will shoot .168grn & 190grn Sierra BT equally well.Loco
 
 
 


Edited by stickbow46 - February/23/2011 at 21:53
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Post Options Post Options   Thanks (0) Thanks(0)   Quote koshkin Quote  Post ReplyReply Direct Link To This Post Posted: February/23/2011 at 18:48
I have a 1-7" twist in my AR and it has a clear preference for 77gr SMKs over all other bullets I have tried.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote tjtjwdad Quote  Post ReplyReply Direct Link To This Post Posted: February/23/2011 at 19:59
- I'm under the impression that all things being equal (weight) the longer the bearing surface, the faster the twist needs to be to stabalize the bullet.
 
- FWIW, it's also known that not all barrel twist are uniform.  In example; a barrel listed as a 1-9 may avtually be a 1- 9.5 or 1- 8.75.  This probably explains why some bullets shoot out of an advertised twist while others won't.
 
- Some bullets just won't shoot in a barrel no matter what you try.  I ran thru this several years ago with an AR-15.  It wouldn't shoot a H75 BTHP (1-8) no matter what.  I was all set to rebarrel when I just happened to try some 77 SMK and presto, it grouped like a premium barrel.
 
- I have a Bushmaster with a 1-9 twist and it won't shoot much over 70 grain bullets with acceptable accuracy for target work.  For grins and giggles I tried a 80 SMK in that barrel and at 100 yards it shot an 8" group.  Went back to a 69 SMK, it was under .250".
 
HTH
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