Page 17 of 20 FirstFirst ... 71516171819 ... LastLast
Results 161 to 170 of 195

Thread: AAC 5.56 Ammo Evaluation

  1. #161
    Join Date
    Apr 2023
    Posts
    8
    Feedback Score
    0
    Quote Originally Posted by markm View Post
    This dog shit continues to shred my nutsack. After reworking hundreds of rounds to a thoroughly tested charge, we got a few FTEs in a know good gun.

    Busted out the chrono and got 2828 fps (on the same 20" Bolt gun) on a load was developed to shoot about 100 fps slower than that.

    At this point, due to the horrible velocity swings and shitty SDs, I'm suspecting the mongoloids who make this shit mixed powders of various lots/burn rates.
    2828fps isnít exactly screaming for a 20Ē bolt gun. Iíve had 2811fps averages from an 18Ē AR running IMI Razorcore.

    That same load that you listed should be around 2760-2775fps in an 18Ē AR.

    If Iím reading your post correctly, these were loads that you had reworked so itís not factory loaded ammo, correct? During reloading of the ammo, did you notice any differences in kernels/color or does it look to be the same brand/type of powder?

    Since Iíve still got several boxes of the same lot youíre using, Iíll try to break down some myself if you donít have any left.

    Would like to help as much as possible, but I havenít had any issues with that same lot #. I ran it this past weekend in a Daniel Defense 16Ē and a KAC 11.5Ē with zero issues. I do have a few additional 10.5, 11.5 and 12.5Ē uppers that I havenít shot this in yet. Iíll try to run them soon to see if I get similar results. I think 2 of them are 5.56 chambers, with 1 being a 223 Wylde.
    Last edited by SuperJLarge; 06-06-23 at 00:55.

  2. #162
    Join Date
    Sep 2007
    Location
    AZ
    Posts
    31,934
    Feedback Score
    14 (100%)
    Quote Originally Posted by SuperJLarge View Post
    2828fps isnít exactly screaming for a 20Ē bolt gun. Iíve had 2811fps averages from an 18Ē AR running IMI Razorcore.
    We use the same 20" bolt gun for every load test so there's good reference. 2828 is just part of the story. The other piece that I can't measure is pressure curve. 2828 with a nice slow powder might work, but 2828 with whatever these booger eaters used is most certainly NOT working.

    As far as visual on the propellant, I can't look at TAC, for example, and tell it from H335. And those have to pretty different burn rates in a 223. The only thing I did see that was curious was posted earlier in this thread. The sticky, clumped powder in every 50th or 100th round.
    Last edited by markm; 06-06-23 at 09:29.
    "What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v

  3. #163
    Join Date
    Nov 2008
    Posts
    427
    Feedback Score
    0
    I don't recall, what chronograph are you guys using ?

    And how firm of a crimp did you apply ?

    I am also curious about who supplied the propellant... and its burn rate.

    FWIW, I have some AAC 77gr Sierra TMK on the way.
    Last edited by bfoosh006; 06-07-23 at 16:36.

  4. #164
    Join Date
    Sep 2007
    Location
    AZ
    Posts
    31,934
    Feedback Score
    14 (100%)
    Quote Originally Posted by bfoosh006 View Post
    I don't recall, what chronograph are you guys using ?
    Magnetospeed.

    Add: Light Factory Crimp. The messed up thing is I shot this 5 round group. 3 in one hole and the 2 by it for like .3 MOA.... with a 26 Standard Deviation!

    Last edited by markm; 06-07-23 at 16:50.
    "What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v

  5. #165
    Join Date
    Nov 2008
    Posts
    427
    Feedback Score
    0
    Quote Originally Posted by markm View Post
    Magnetospeed.
    Oops... I added to my post.
    Last edited by bfoosh006; 06-07-23 at 16:54.

  6. #166
    Join Date
    Jun 2023
    Posts
    1
    Feedback Score
    0

    Similar poor experiences.

    Had 12 primers blown out in 100 rounds, Ejector indent marks similar to those seen on a previous post. Threw the rest away.
    Brand new Criterion hybrid, 14.5", .223W chamber.
    Running a Dead air sandman K on the end.

    IMG_2792 (1).jpg

  7. #167
    Join Date
    Nov 2013
    Posts
    564
    Feedback Score
    0
    Picked up 500 rounds of AAC 77 gr OTM from palmetto last month and shot half. No issues with failure to fire or extract, Chrono showed consistent velocities over a sample of rounds from each box. Cases were clean and undented, better than pics I've seen online from other lots. Gun was a 14.5 factory BCM upper.

    Sent from my SM-A326U using Tapatalk

  8. #168
    Join Date
    Sep 2007
    Location
    AZ
    Posts
    31,934
    Feedback Score
    14 (100%)
    I can't believe there's not been a Kaboom with this crap.
    "What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v

  9. #169
    Join Date
    Apr 2023
    Posts
    8
    Feedback Score
    0
    Quote Originally Posted by MidwestExpress View Post
    Had 12 primers blown out in 100 rounds, Ejector indent marks similar to those seen on a previous post. Threw the rest away.
    Brand new Criterion hybrid, 14.5", .223W chamber.
    Running a Dead air sandman K on the end.

    IMG_2792 (1).jpg
    What lot #?


    Welcome to the site!

  10. #170
    Join Date
    Mar 2008
    Location
    Utah, USA
    Posts
    1,684
    Feedback Score
    4 (100%)
    I see MidwestExpress is running a 223W chamber and is having issue. Hush is running a BCM which I would assume has a true 5.56 chamber.

    Are the others that are having issues using a 5.56 chamber?

Page 17 of 20 FirstFirst ... 71516171819 ... 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
  •