Load work on my Grendel

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  • Jorge0272
    Bloodstained
    • Jan 2018
    • 63
    #1

    Load work on my Grendel

    Hey guys, finally back from a long hiatus of shooting and reloading due to life.
    Anyways, I purchased a 12" and an 18" group buy barrel quite a while. I did shoot the 12" with some handloads. Shot terrible, but probably because it was the first rounds on that barrel and the loads were not really for it. anyways:
    Did some load development this weekend at the range.
    This is with the 18" Group buy barrel and bolt.

    Temp: 62deg F, Humidity: 93% and Baro: 30.02
    Speeds were from a Magnetospeed Sporter
    No crimp on any of these loads. Shoudl I add a slight crimp?

    26.1gr of AR-COMP
    Hornady 120GR ELD-M at 2.2"
    AVG 2317
    SD 11
    ES 30
    Group 0.75"

    27.6gr of AR-COMP
    Hornady 123GR SST at 2.245"
    AVG 2423
    SD 14
    ES 34
    Group 0.50" (This was the best group of the day)

    27.9gr of AR-COMP
    Hornady 123GR SST at 2.245"
    AVG 2438
    SD 9
    ES 23
    Group 1.25"

    28.2gr of AR-COMP
    Hornady 123GR SST at 2.245"
    AVG 2426 (velocity and accuracy started dropping )
    SD 9
    ES 25
    Group 2.0"

    30.6gr of CFE223
    Hornady 123GR SST at 2.245"
    AVG 2385
    SD 23
    ES 63
    Group 3.0"

    30.9gr of CFE223
    Hornady 123GR SST at 2.245"
    AVG 2405
    SD 9
    ES 26
    Group 3.5"

    31.2gr of CFE223
    Hornady 123GR SST at 2.245"
    AVG 2419
    SD 11
    ES 30
    Group 1.75" (seems accuracy started to come back, but this was starting to max out and did not want to go higher)

    Any suggestions on how to tighten up the CFE loads? Longer or shorter OAL?

    I believe I will no longer use CFE223. Looks like the first two are the way to go. Funny how the heavier bullet takes a heavier charge, but as you can see on the target (top two targets) the did great except for the flyer. ( I actually know I pulled those) Sucks because I have a lot of CFE223. I guess CFE for my 556 AR plinking round.

    Target.jpg
    Last edited by Jorge0272; 10-26-2020, 02:07 AM. Reason: Add info
    Tags: ar-comp, grendel, hornady sst
  • LRRPF52
    Super Moderator
    • Sep 2014
    • 8618
    #2
    You can push the COL out longer if your mags will allow it and see if that helps with the CFE223/123gr SST loads.

    Also, try double seating with a half-stroke, rotate the case, and do the final stroke when seating bullets.

    When you increase the COL, it will require a little more propellant to reach the same speeds.
    NRA Basic, Pistol, Rifle, Shotgun, RSO

    CCW, CQM, DM, Long Range Rifle Instructor

    6.5 Grendel Reloading Handbooks & chamber brushes can be found here:

    www.AR15buildbox.com

    Comment

    • Texcl2
      Warrior
      • Sep 2020
      • 112
      #3

      Comment

      • 1Shot
        Warrior
        • Feb 2018
        • 781
        #4
        It just may be that your barrel does not like the Hornady 123 SST bullet. Neither of my rifles with different make barrels will shoot this bullet very accurately no matter what powder or load you use and it shot the factory ammo the worst. Both of my rifles shoot the 120 Sierra Pro Hunter and Speer Gold Dot supper accurately and both are good deer size game bullets. I like the Gold Dot the best.

        Comment

        • Harpoon1
          Chieftain
          • Dec 2017
          • 1123
          #5
          Any suggestions on how to tighten up the CFE loads? Longer or shorter OAL?
          https://youtu.be/dv-t0vO9IR8


          Fine tune the group size (barrel harmonics/timing) with bullet seating depth.

          https://youtu.be/6VEMZJYovMA


          https://youtu.be/oRXlCG9YZbQ
          Last edited by Harpoon1; 10-26-2020, 02:35 PM.

          Comment

          • Jorge0272
            Bloodstained
            • Jan 2018
            • 63
            #6
            Ok. Going to try a couple of 31.2 CFE223 at make the length 2.26 or max out the mag length.
            Per the top right target, it seems the barrel likes the 123SST with ARCOMP.
            What is another good hunting round that is known to be a good shooter in these barrels with ARCOMP or CFE223?

            Comment

            • Bobke
              Warrior
              • Dec 2015
              • 256
              #7

              Comment

              • Texcl2
                Warrior
                • Sep 2020
                • 112
                #8

                Comment

                • Jorge0272
                  Bloodstained
                  • Jan 2018
                  • 63
                  #9
                  Originally posted by Harpoon1 View Post
                  https://youtu.be/dv-t0vO9IR8


                  Fine tune the group size (barrel harmonics/timing) with bullet seating depth.

                  https://youtu.be/6VEMZJYovMA


                  https://youtu.be/oRXlCG9YZbQ
                  That was very informative!!
                  Will be trying this method to try and come up with a better shooting round. Thank you!!

                  Comment

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