Page 1 of 17 12311 ... LastLast
Results 1 to 10 of 170

Thread: Why not 1/8 twist?

  1. #1
    Join Date
    Mar 2011
    Location
    where the army sends me
    Posts
    219
    Feedback Score
    1 (100%)

    Why not 1/8 twist?

    So saw this video earlier today and I've wondered about this before seeing this
    http://youtu.be/lv8Zklkfa3I
    Question is this, are most people hesitant about a 1/8 twist rate because it's not "mil-spec"? Or is there a legit reason I shouldn't consider this twist rate for my next upper? The way I see it, I'll be able to shoot rounds in the 55-77 grain range without issue, and that's really what I'm looking for, versatility.
    The journey of a thousand miles begins with one step...and a lot of bitching.

  2. #2
    Join Date
    Mar 2013
    Posts
    616
    Feedback Score
    0
    I prefer 1/8. Any SS barrel I buy is 1/8 because in my opinion, it's the most versatile. Unfortunately, if you want a hammer forged chrome lined barrel, it's going to be 1/7. Any top notch chrome lined barrel is going to come 1/7 in most cases. I'm glad to see some companies such as Sionics make decent 1/8 chrome lined barrels.

  3. #3
    Join Date
    Oct 2013
    Location
    E WA
    Posts
    148
    Feedback Score
    0
    I'm building an upper RIGHT NOW with a 1 in 8 barrel.
    I think that twist rate is perfect

  4. #4
    Join Date
    Aug 2008
    Location
    West of the Atlantic
    Posts
    1,803
    Feedback Score
    0
    I think many people are educated enough at this point in time to understand that a 1/8 barrel is an excellent twist rate. There was a time where many barrels in the chrome lined category that were using lesser grades of steel were also by chance not a 1/7 twist, often a 1/9. So people pretty much poo poo'd anything outside of 1/7. When in reality 1/8 falls well within the optimal range for a wide variety of bullet weights. There are very good quality barrels these days offered in a 1/8 and I too own a few.

  5. #5
    Join Date
    Mar 2013
    Posts
    616
    Feedback Score
    0
    Quote Originally Posted by Surf View Post
    I think many people are educated enough at this point in time to understand that a 1/8 barrel is an excellent twist rate. There was a time where many barrels in the chrome lined category that were using lesser grades of steel were also by chance not a 1/7 twist, often a 1/9. So people pretty much poo poo'd anything outside of 1/7. When in reality 1/8 falls well within the optimal range for a wide variety of bullet weights. There are very good quality barrels these days offered in a 1/8 and I too own a few.
    Yup, that makes perfect sense. You do see a lot of the cheaper companies using 1/9 barrels.

  6. #6
    Join Date
    Jan 2010
    Location
    South Central Wisconsin
    Posts
    612
    Feedback Score
    0
    Well considering that the AR15/M16 platform was originally rifled for 1:7.7, I don't think 1:8 is a bad choice.

    There are several good quality barrel makers cutting 1:8 twist CMCL (chrome moly/chrome lined) (and 1:7.7 too) out there. If you do a bit of searching you will find several.
    Quote Originally Posted by markm View Post
    But you should have enough mags that you don't need to see a grief councelor if you destroy or damage one.

  7. #7
    Join Date
    May 2013
    Location
    Permian Basin
    Posts
    2,930
    Feedback Score
    3 (100%)
    Because the tdp calls for a 1/7 twist, thats why. I am, however building a 300blk upper w/ 1/8 twist. I think it will be ok.

  8. #8
    Join Date
    Mar 2013
    Posts
    616
    Feedback Score
    0
    Quote Originally Posted by SilverBullet432 View Post
    Because the tdp calls for a 1/7 twist, thats why. I am, however building a 300blk upper w/ 1/8 twist. I think it will be ok.
    The lightest the Mil goes is 55gr....right? I think 1/7 is good for them but I believe the average civilian would benefit more from 1/8. There are some very nasty rounds that come in less than 55gr and 1/7 can be just a little to fast for them.

    Not to mention, I think 1/8 is probably the best SHTF twist you can get. It should be dead accurate with any round you come across. Then again, a few inches here or there probably wouldn't matter when the zombies get here.

    Sent with a Gen 2 Nexus 7

  9. #9
    Join Date
    Dec 2009
    Location
    Utah
    Posts
    8,421
    Feedback Score
    3 (100%)
    Quote Originally Posted by The_Hammer_Man View Post
    Well considering that the AR15/M16 platform was originally rifled for 1:7.7, I don't think 1:8 is a bad choice.

    There are several good quality barrel makers cutting 1:8 twist CMCL (chrome moly/chrome lined) (and 1:7.7 too) out there. If you do a bit of searching you will find several.
    It first used 1:14, then was later changed to 1:12
    INSIDE PLAN OF BOX
    1. ROAD-RUNNER LIFTS GLASS OF WATER- PULLING UP MATCH
    2. MATCH SCRATCHES ON MATCH-BOX
    3. MATCH LIGHTS FUSE TO TNT
    4. BOOM!
    5. HA-HA!!

    -WILE E. COYOTE, AUTHOR OF "EVERYTHING I NEEDED TO KNOW IN LIFE, I LEARNED FROM GOLDBERG & MURPHY"

    http://i115.photobucket.com/albums/n289/SgtSongDog/AR%20Carbine/DSC_0114.jpg
    I am American

  10. #10
    Join Date
    Dec 2008
    Posts
    5,117
    Feedback Score
    7 (100%)
    Firstly, I've received two new barrels the last several weeks to evaluate, and both are 1/8. Thus far both have shown to be accurate barrels using a number of different weighted projectiles. That said, I believe currently it's en vogue to do barrels in 1/8...and has been over the last cpl. years at least. On paper it's makes perfect sense....a twist rate that accommodates not only heavy projectiles like 1/7, but also should have the ability to accurately shoot light projectiles that in theory go best with a 1/9.

    The rub is the fact that my real world observations, and testing haven't shown the 1/8 to shoot lighter projectiles more accurately, and moreover they have shown to be less accurate with heavies than the 1/7. Every 1/7 I can remember testing has shot 40-60gr. poly tipped loads as good as it shoots 77gr. SMKs. I'm still waiting on my first lightweight projectile to vaporize coming out of a 1/7 barrel. So quite honestly, there is no real good reason for a 1/8 other than the great sounding theory that it shoots lighter bullets better than the 1/7. My pair of Rock 5R SS 1/7 barrels shoot the Hornady 40gr. Vmax into roughly a MOA 10rd group.

Page 1 of 17 12311 ... LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •