Page 3 of 4 FirstFirst 1234 LastLast
Results 21 to 30 of 40

Thread: 1:7 v. 1:9 for 55gr/75 gr

  1. #21
    Join Date
    Aug 2010
    Location
    Bakersfield, CA
    Posts
    221
    Feedback Score
    5 (100%)
    One of the best informative post I have seen in a long time. I am now at ease knowing that my 1/7 twist barrel was not a bad decision. I always fretted about the decision concerning the fast twist with the light weight bullets for varmit hunting, due to what I have read. Thank You!

  2. #22
    Join Date
    Aug 2010
    Location
    St. Augustine, Florida
    Posts
    160
    Feedback Score
    1 (100%)
    Outstanding job!

    Thanks for all the information!
    "We will never sleep, 'cause sleep is for the weak.
    And we will never rest, 'til we're all fking dead" -- O.S.

  3. #23
    Join Date
    May 2010
    Posts
    43
    Feedback Score
    0
    Super informative. Thanks

  4. #24
    Join Date
    Jan 2008
    Location
    AZ-Waging jihad against crappy AR's.
    Posts
    24,902
    Feedback Score
    104 (100%)
    The other day I was out shooting with markm. I brought the Noveske and the SBR. Someone out there had a laser range finder and lased the steel target up on the hill at about 293 yards.

    I was able to consistently nail it using the SBR with suppressor in place, using Hornady 55gr. TAP and my ACOG.

    The Noveske also hit it with regular boredom which surprised me because we had zeroed it previosly with Prvi Partizan 75gr. match ammo.



    Owner/Instructor at Semper Paratus Arms

    Facebook: https://www.facebook.com/SemperParatusArms/

    Semper Paratus Arms AR15 Armorer Course http://www.semperparatusarms.com/cou...-registration/

    M4C Misc. Training and Course Announcements- http://www.m4carbine.net/forumdisplay.php?f=141

    Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com

  5. #25
    Join Date
    Nov 2008
    Posts
    1,343
    Feedback Score
    0
    Quote Originally Posted by vicious_cb View Post
    The only problem Ive seen with light bullets and a 1:7 twist barrel was with 36gr varmint grenades.
    Keep in mind that the Varmint Grenade is not a lead-core bullet.
    All that is necessary for trolls to flourish, is for good men to do nothing.

  6. #26
    Join Date
    May 2009
    Location
    Mid-Atlantic states
    Posts
    240
    Feedback Score
    13 (100%)

    What he said...

    Quote Originally Posted by Failure2Stop View Post
    Why don't you just test the ammo you intend on shooting before getting a new barrel?
    There is a decent probability that it will work and it will give you a bench mark in case you are not satisfied with how it performs.
    It's a lot cheaper than a new barrel.
    Just sayin'.
    Well worth trying what you currently have with the heavier bullets. I have a 1:9 Colt 16" HBAR that shoots 55gr military ball and 75gr Hornady TAP with great results.

    A friend has the indentical upper...his doesn't handle 75gr TAP.

    Bottom line: you won't know unless you try.


    -Rainman

  7. #27
    Join Date
    Mar 2009
    Location
    Odessa TX
    Posts
    92
    Feedback Score
    4 (100%)
    I was having some pretty good results today with my 1/7 BCM 14.5in A2X pinned upper. 50yd zero, 55gr Hornady .223, 4moa Aimpoint, my dad spotting, and a decent hold over I was getting consistent hits out to 500 meters on steel plates. Fun stuff

    West Texas

  8. #28
    Join Date
    Nov 2008
    Posts
    13
    Feedback Score
    0
    OK, I gotta ask, why not use a 1:8 barrel? It looks like that would cover all the bullet weights in question. Am I missing something?

  9. #29
    Join Date
    Jul 2010
    Posts
    70
    Feedback Score
    15 (100%)
    Lots of good info here. I always wondered about over-spinning lighter bullets with the faster twists. I started shooting .223 at varmints out of a bolt gun, 50gr V-maxes are hard to beat... I havn't tried it in my ARs, I guess I'll have to see what happens. I had to swap to the Varmint Grenades here in Cali because of the condor-no-lead zone.... I'll have to see if they'll hold up in my AR as well, I'm running 1:9 barrels... no rational there, just what I ended up with.

  10. #30
    Join Date
    Nov 2008
    Posts
    1,343
    Feedback Score
    0
    Quote Originally Posted by MustangGreg66 View Post
    Lots of good info here. I always wondered about over-spinning lighter bullets with the faster twists. I started shooting .223 at varmints out of a bolt gun, 50gr V-maxes are hard to beat... I havn't tried it in my ARs, I guess I'll have to see what happens. I had to swap to the Varmint Grenades here in Cali because of the condor-no-lead zone.... I'll have to see if they'll hold up in my AR as well, I'm running 1:9 barrels... no rational there, just what I ended up with.
    The Hornady 50 grain V-MAX bullets shoot quite well from AR-15s with 1:7" twist barrels. With only minimal load development, I turned in the 10-shot group shown below from a distance of 100 yards.




    Here's a 50 grain V-MAX group for the Internet Commando's in our viewing audience (fired uphill, in the rain, no less!)



    All that is necessary for trolls to flourish, is for good men to do nothing.

Page 3 of 4 FirstFirst 1234 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
  •