Rifleshooter Grendel Article The Howa Miniaction and Load Development

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  • pinetreebbs
    Warrior
    • Nov 2013
    • 184

    Rifleshooter Grendel Article The Howa Miniaction and Load Development

    "6.5 Grendel loads in a Howa MINIACTION (6.5 Grendel load development)"

    While the 6.5 Grendel is well established in the AR-15/M16 M4, it’s compact size and perceived long range effectiveness have also made it a desirable choice for low-recoiling bolt-action rifl…
  • Sticks
    Chieftain
    • Dec 2016
    • 1922

    #2
    Huh. Someone else that can not get the 107's to group.
    Sticks

    Catchy sig line here.

    Comment

    • roor
      Warrior
      • Jan 2018
      • 103

      #3

      Comment

      • Stinky Coyote
        Warrior
        • Dec 2017
        • 640

        #4
        Originally posted by roor View Post
        Does anyone know what kind of stock that is from the article? Hope it isn’t as much as xlr
        mdt lss

        Comment

        • roor
          Warrior
          • Jan 2018
          • 103

          #5

          Comment

          • Drillboss
            Warrior
            • Jan 2015
            • 894

            #6
            Originally posted by roor View Post
            I may not know much but I’m pretty sure lss is the chassis

            I’m interested in the butt stock/shoulder rest, or whatever you wanna call it. I think democrats even call it the shoulder thing that goes up.
            It's all included in the article:

            MDT Carbine Skeleton stock

            Comment

            • LRRPF52
              Super Moderator
              • Sep 2014
              • 8569

              #7
              Here's what I got from my 22" Howa:

              123gr SST
              Federal brass 1x fired 1.208" headspace to shoulder datum
              Rem 7 1/2 SRP
              Hodgdon's LEVERevolution
              COL: 2.250"
              Temp: 60˚F on range thermometer
              Chrony Beta Master 15ft from muzzle

              29.8 2453
              30.1 2465
              30.4 2499
              30.7 2517
              31.0 2534
              31.3 2596
              31.6 2608
              31.9 2605
              32.2 2658 (This averages 51,551psi in a SAAMI chamber.)


              129gr SST
              Lapua brass 1.215" headspace to datum
              Rem 7 1/2 SRP
              LEVERevolution
              COL: 2.310"
              60˚F

              Left string was shot first, then the right one
              29.3 2370 2407
              29.6 2393 2400
              29.9 2448 2405
              30.2 2453 2404
              30.5 2504 2453
              30.8 Error 2475
              31.1 2485 2512
              31.4 2530 2523
              31.7 2534 2545
              32.0 2572 2572

              31.2gr CFE / 123gr AMAX load
              2599
              2557
              2582
              2617
              2617
              2564
              2586
              2608
              2619
              2566
              AVG: 2592fps. (AVG chamber pressure with this load is 46,235psi. in a SAAMI chamber.)

              Hornady American Gunner 123gr BTHP
              2469
              2456
              2465
              2463
              2437
              AVG: 2458fps

              Everything fed fine from the mag even the 129gr SSTs at 2.310" COL. I think I would choose the 129gr SST load for hunting, didn't notice too much difference in recoil. Fun little rifle to shoot.

              All my primers have nice little dimples in them. I didn't see anything crazy going on with the brass, not that I rely on brass as a sign of excessive pressure, but I definitely still look at it. Even the Federal brass looks good.

              If I loaded up the 107gr SM or TMK on 8208 XBR, I would have no problem reaching 2750fps from a 22" bolt gun.

              Without even pushing a max load with the 107gr SMK, I'm getting 2626fps from a 17.6" barrel with 8208 XBR.

              I noticed the author used H335, X-Terminator, 8208, and TAC. I would recommend trying LeveRevolution and CFE223 if he wants to see some speed.
              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

              • Jmccracken
                Warrior
                • Dec 2017
                • 206

                #8
                Originally posted by Sticks View Post
                Huh. Someone else that can not get the 107's to group.
                They grouped great in my ruger

                Comment

                • mongoosesnipe
                  Chieftain
                  • May 2012
                  • 1142

                  #9
                  just skiming the article and considering they only tested 1 bullet and a handful of powders, basically ran a ladder test with each powder and averaged all the shots some of which went terrible..... that said every powder had a sub minute node so to say the 107 doesn't group seems like a broad sweeping statement, it would have been nice to see him shoot a known factory load as a benchmark i think considering the expense of equipment used in the article between the rifle chasis scope and mounts a box of hornady could certainly have went through the gun

                  i enjoyed that his synopsis seem to be you cant make grendel into a creedmore though that seems to be what he was going for
                  Punctuation is for the weak....

                  Comment

                  • Sticks
                    Chieftain
                    • Dec 2016
                    • 1922

                    #10
                    Those 22" Howas have a long chamber. All 4 of the ones (20" Bull) I have handled won't chamber anything past 1.160". Sucks as all of my AR loads are 1.175
                    Sticks

                    Catchy sig line here.

                    Comment

                    • grayfox
                      Chieftain
                      • Jan 2017
                      • 4295

                      #11
                      ? I don't recognize what a 1.160" or 1.175" dimension is for...
                      I load 130 Accubonds in my 20" HB to 2.300-2.305 Coal and they still have room.
                      "Down the floor, out the door, Go Brandon Go!!!!!"

                      Comment

                      • Sticks
                        Chieftain
                        • Dec 2016
                        • 1922

                        #12
                        Originally posted by grayfox View Post
                        ? I don't recognize what a 1.160" or 1.175" dimension is for...
                        I load 130 Accubonds in my 20" HB to 2.300-2.305 Coal and they still have room.
                        Headspace. Case base to shoulder/Datum.

                        When I resize a case, I bump back .003-.004 from fired length. That was putting my AR rounds at 1.175 (a little longer now in my Barlitien). All of the Howas are at 1.145 max. Putting a resized case in that measures 1.160 will not let the bolt close.

                        So now I have to size for two different chambers, as I am not going to over work my AR brass.

                        EDIT - Numbers are off I think. I am out of town.

                        1.117 is my AR sized, fired is 1.121+. Howas measure 1.114 fired. Factory rounds are 1.109 +/- .001
                        Last edited by Sticks; 02-24-2018, 09:52 AM.
                        Sticks

                        Catchy sig line here.

                        Comment

                        • grayfox
                          Chieftain
                          • Jan 2017
                          • 4295

                          #13
                          Your edited lengths are more in line with what I've been getting from my headspace measurements, 1.110 - 1.122 for unfired/fired (AR), 1.116 for the Howa fired.
                          "Down the floor, out the door, Go Brandon Go!!!!!"

                          Comment

                          • rickt300
                            Warrior
                            • Jan 2017
                            • 498

                            #14
                            The rifle in the article does not seem as accurate as the HOWA HB that I foolishly traded off. At any rate I ordered another though this one is a 22 inch barreled version. Can't wait to run some of LRRPF52's loads in it.

                            Comment

                            • Sinclair
                              Warrior
                              • Feb 2018
                              • 344

                              #15
                              LRRPF52, I am curious as to how you get chamber pressures.
                              Sinclair
                              "A Patriot must always be ready to defend his Country against his government"
                              Edward Abbey

                              "Stay out of trouble, Never give up, Never give in, Watch you're six, Hold the line, Stay Frosty."
                              Dr. Sabastian Gorka, Hungarian by birth, American Patriot by Beliefs.

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