Quantcast
  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

AR15 going from stock m4 barrel to 24" Varment

Discussion in 'Rifle Country' started by helz_mcfugly, Oct 9, 2008.

Thread Status:
Not open for further replies.
  1. helz_mcfugly

    helz_mcfugly Member

    Joined:
    Sep 15, 2008
    Messages:
    735
    Location:
    TX
    I have a Bushmaster AR15 M4 with a 16" barrel. right out of the box at 100 yards I was shooting 1 1/2 to 2 inch groups. I free floated the factory barrel and improved my groups to 1 to 1 1/2 inchs. Now Im puting a Bushmaster A3 Varmint Upper with a free floated E.R. Shaw 24" SS Bull Barrel with a 1/9 twist on it.
    1. Does anyone have one of these barrels?
    2. how much tighter should my groups get at 100, 200 yards?
    3. what grain bullet and powder charge does this barrel like to eat?

    I have been using hornady 55 grain fmjbt with 21 grains of H322.

    here is gun before and after the bull barrel
    [​IMG]
    AFTER
    [​IMG]
     
    Last edited: Oct 9, 2008
  2. rcmodel

    rcmodel Member in memoriam

    Joined:
    Sep 17, 2007
    Messages:
    59,082
    Location:
    Eastern KS
    If you are after accuracy, you will have to change to accurate bullets.

    Nobody's FMJ-BT bullets will do much better then 1 to 1 1/2 MOA out of any barrel.

    Try Match HP's, or Hornady V-Max, or Nosler Ballistic-Tips.

    Almost any bullet with the jacket opening in the nose will group better then FMJ with the opening in the base.

    Because all the bases are square, and all exactly the same.

    rcmodel
     
  3. helz_mcfugly

    helz_mcfugly Member

    Joined:
    Sep 15, 2008
    Messages:
    735
    Location:
    TX
    should I go to a higher grain for the 200 yard range? like 69 fmjhp?
     
  4. rcmodel

    rcmodel Member in memoriam

    Joined:
    Sep 17, 2007
    Messages:
    59,082
    Location:
    Eastern KS
    If you shoot in the wind, it couldn't hurt.

    rcmodel
     
  5. gvnwst

    gvnwst Member

    Joined:
    Mar 17, 2008
    Messages:
    2,614
    Location:
    Somewhere.........
    tell that to lapua.....:D

    for the most part, yes go with better bullets, try some hornady TAP or their match ammo. Federal gold match sets the standard of match ammo from the factory. you should get around .75 MOA groups at ranges to 300 with the correct ammo.
     
Thread Status:
Not open for further replies.

Share This Page