twist in barrels

[jkcerda]

1x7
1x8
1x9 what in the world are the differences?

noob here

AR platform BTW

[dieselpower]

http://www.ar15.com/forums/topic.html?b=12&f=6&t=102

[novalondon]

1 stands for a complete twist and the rifling, 7,8 or 9 stands for the length in inches for the twist to take place. ::::1/9 twist is a barrel that has a rifling twist of one full turn or 360 degree spin in 9 inches...

[Code7inOaktown]

You have to read the entire thread but it has pictures to make it easier.

http://www.m4carbine.net/showthread.php?t=67792

[jkcerda]

I understand what the twist does, what I would like to know is whats preferred ETC, which, if any, leads to a more accurate rifle?

[jkcerda]

http://www.ar15.com/forums/topic.html?b=12&f=6&t=102

ahhhhh, thanks.

Here is the info I have collected for .223 twist ratios from various sources (including in-house testing & ammo manf. contacts).



1x7 - technically too tight of a twist for any .224 bullet widely available, including the 80 gr. Manufactured originally to stabilize SS109 and/or tracer ammo, but further military testing has shown other twists to be superior. Some of the very heavy custom stuff (87 gr?) may work well, but why????



1x8 - great twist for 69-80 gr bullets. Sierra once informed me that the perfect twist for their 80gr was 1x8.2xxxxx (blah blah blah big long engineers explanation followed).



1x9 - good all around twist ratio. Best suited for 52-69 gr, but either end of the envelope will be questionable.



1x10 - practically the same as 1x9, but favors the lighter side a little more.



1x12 - great for the 40-52 gr bullets. Most often found on bolt action rifles as their primary use is varminting. All right for the 55 gr, but not the best.



1x14 - if you want to understabilize the .224 bullet, use this twist. Useless except for tumbling effect it causes upon bullet impact. IMHO, better to shoot straight with a good HP bullet as your chances to hit are better and damage will most likely be greater also.

so it matters a great deal what ammo I use.

[-hanko]

1x7
1x8
1x9 what in the world are the differences?

noob here

AR platform BTW

"Noob", not likely.

Google...not here but via google.com.
Try ar15 barrel twist

hth

-hanko

[jkcerda]

"Noob", not likely.

Google...not here but via google.com.
Try ar15 barrel twist

hth

-hanko

first AR,, deciding between purchase or build.

guessing for the cheap walmart ammo, 1 x 9 would be best suited?
thanks for the link

[bombadillo]

1:8 tends to be about the best IMO. It will stabilize pretty heavy stuff and still go down to the low fifty grain stuff and potentially even 45gr stuff. They shoot well and you'll usually only find 1:8 twist barrels on the higher end match rifles and guns designed for 3 gun or other run and gun activities. They are found a lot in white oak armament's barrels and compass lake. They make phenomenal barrels.

[SideWinder11]

2000+ post on here and your don't know what twist is/ or why one is different or better than another??

All I can say is WOW!

[mif_slim]

1-9 is the best for all around shooting. My Su-16 can shoot 75gr hpbt just fine and it's a 1-9. Might not be true to all but mines hold it fine.

If your planning to shoot heavier gr or, longer bullet actually, a 1-7 will be better. Such as VG 55gr and 75gr, amax 80 gr and 855 will work just right for that twist.

If you like you can choose 1-8 which is good but usually made with soft metal like stainless steel so in turn your barrel life is shorten a bit.

Bottomline, choose your sculpting style and you will know what you need.

[mif_slim]

1-9 is the best for all around shooting. My Su-16 can shoot 75gr hpbt just fine and it's a 1-9. Might not be true to all but mines hold it fine.

If your planning to shoot heavier gr or, longer bullet actually, a 1-7 will be better. Such as VG 55gr and 75gr, amax 80 gr and 855 will work just right for that twist.

If you like you can choose 1-8 which is good but usually made with soft metal like stainless steel so in turn your barrel life is shorten a bit.

Bottomline, choose your shooting style and you will know what you need.

[mif_slim]

Double post?! Stupid phone.... Sorry.

[jkcerda]

2000+ post on here and your don't know what twist is/ or why one is different or better than another??

All I can say is WOW!

all my post are in the OT

trust me, higher post count has nothing to do with knowledge

I TRY and stay away from the classifieds, BUT, selling my howa is going to let me finally get an AR.

I know very little, but, figured I would ask BEFORE i bought, I am guessing I want a Varmint rig. one post above likes the 1 x 8 for all around, I want to see who else agrees.

thanks.

[SideWinder11]

I was going to guess and OT post whore.

Get a 1:8 best all around.

End of thread..............