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  • 458 SOCOM load data...

    *DISCLAIMER*
    The load data contained in this forum is intended for use with specific components. Other manufacturers components may not produce equivalent pressure or velocities; therefore, it is recommended that the user be familiar with the basic rules of reloading safety. Safety folders are available from the National Re-loading Manufacturers Association (NRMA) and the Sporting Arms and Ammunition Manufacturers Institute (SAAMI). All can be obtained free by writing:

    NRMA/SAAMI Safety Folders
    One Centerpointe Drive
    Suite 300
    Lake Oswego, Oregon 97035

    Data contained herein is intended for use by individuals who are familiar with correct and safe handloading practices and procedures. We strongly urge beginning handloaders to research and study as much information as possible prior to handlloading. If you are unfamiliar with any reloading operation or procedure we strongly recommend you become familiar with the operation of your equipment through the manufacturer's operator's manual and seek technical assistance.

    Because Beyond556.com and its affiliates have no control over the individual loading practices and/or components used, no responsibility is assumed by Beyond556.com or its affiliates in the use of this data. The information is to be used at the sole discretion of the user and the user assumes all risk.

    CAUTION
    Beyond556.com has not independently verified the accuracy of all of the data contained in this forum. Failure to follow safe loading practices could result in severe personal injury (including death) or gun damage to the user or bystanders. Technical data and information contained herein are intended to provide information based upon the limited experience of individuals under specific conditions and circumstances. They do not detail the comprehensive training, procedures, techniques and safety precautions that are absolutely necessary to properly carry on similar activity. Always consult comprehensive reference manuals and bulletins for details of proper training requirements, procedures, techniques and safety precautions before attempting any similar activity. Be alert- publisher cannot be responsible for errors in published load data.

    Please only put LOAD DATA associated with the 458 SOCOM in this thread. Questions and comments should be placed in the General reloading section.

    Some basic load data to get started... There is a bunch more to come..

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    Last edited by TonyM; 12-24-2010, 19:25.

  • #2
    Milage may vary...

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    • #3
      Some Cast Bullet Load data

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      Courtesy of Capt. Jack
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      • #4
        Courtesy of Starfury...

        RRA Upper 16” Barrel
        Bullet: 300gr JHP Rem
        Brass: Starline
        Powder: Winchester 296
        Primer: Wolf Magnum Large Pistol
        Case Trim Length: 1.570”
        Cartridge OAL: 2.060”
        Crimped with Lee Factory Crimp Die (set 3/8 turn past contact)
        Avg velocity based on 3 to 5 shot strings
        Temp ~85F
        Charge (gr) Velocity (ft/sec)
        32 1709
        33 1754
        34 1806
        35 1877
        36 1926

        The 32 to 34 gr charges are light for the W296 (which needs to be confined), the 35 and 36 gr charges burned much cleaner. Will try some in the 36 to 36.5 gr range at 2.03" OAL when I get time.



        Bullet 405gr JSP Rem
        Brass: Starline
        Powder: Winchester 296
        Primer: Wolf Magnum Large Pistol
        Case Trim Length: 1.570”
        Cartridge OAL: 2.140”
        Crimped with Lee Factory Crimp Die (set 3/8 turn past contact)
        Avg velocity based on 3 to 5 shot strings
        Temp ~85F
        Charge (gr) Velocity (ft/sec)
        31 1512
        32 1570
        33 1609

        Comment


        • #5
          With all the usual disclaimers: Your performance may vary, Use Caution,
          Reduce starting Charge weight by 10 percent, Etc.

          300 Gr. Barnes X
          Starline Brass
          WLP primer
          Seated to OAL of 2.255"
          32.0 Gr. of Lil'Gun Slight flattening of Primer
          33.0 Gr. of Lil'Gun Some Primer Flattening and smearing of Brass on Casehead.

          330 Gr. Barnes Banded
          Starline Brass
          WLP primer
          Seated to OAL of 2.225"
          39.0 Gr. of H4198 One out of Five single loaded Rounds Failed to Lock Open.
          40.0 Gr. of H4198 Reliable Load, No indication of primer Flattening
          41.0 Gr. would be approaching a Compressed Load.

          Comment


          • #6
            From Arty...

            The following is not a lot, but it's what I have. I offer it as nothing more than food for thought, knowing I have much more work to do. And looking forward to every moment of it!!
            Note - ALL loads are w/ Winchester Large Pistol primers, new brass sized in LEE die. From my notes:

            (Having used RE-7 on light weight 45-70's, that's where I started)
            COL 2.136, slight crimp in upper canalure, no chrony:
            36gr RE-7, fired 3 rounds, cycled OK, unburned powder in bbl, cleaned bbl.,
            37gr RE-7, fired 3 rounds, Cycled OK, still unburned powder, no primer flattening, no bolt imprint, cleaned bbl.,
            38gr RE-7, fired 3 rounds, cycled OK, unburned powder, but less than before, some primer flattening, slight bolt imprint, cleaned bbl.
            39gr RE-7, fired 3 rounds, similar results as 38gr.
            40gr RE-7, fired 3 rounds, still a little unburned powder, significant primer flattening and visible bolt imprint.
            Heavy crimp may improve burn. Pressure already getting high. Drop RE-7 from further use.

            I went back to the bench and loaded several strings of various powders and returned with the chrony:

            35gr Lil Gun, 3 rounds, 1965, 1949, 1976 fps, much to hot, damaged brass!
            40gr H4198, 1683, 1682, 1687 fps, second round jammed, clean burn, no primer flattening,
            41gr H4198, 1714, 1747, 1732 fps, second round jammed!, clean burn, no primer flattening,
            (At this point I decided to bring seating depth out to almost match COL of 5.56 NATO Cartridge, better feed?. Seated next loads to 2.23 COL, no crimp. All strings three rounds.)(Note - When range testing I charge my cases in the shop and plug each one, for .45's a plug cut from 1/2 inch foam rope insulation, I then seat the bullets at the range. That way I don't end up having to pull bullets from over charged cases.)
            38gr Accurate Arms 1680 powder, 1693, 1694, 1687 fps, clean burn, no primer flattening,
            39gr Accurate Arms 1680 powder, 1751, 1738, 1748 fps, clean burn, very slight primer flattening.
            40gr Accurate Arms 1680 powder, err, 1812, 1749 fps, clean burn, slight primer flattening.
            41gr Accurate Arms 1680 powder, no chrony response! it's dead! slightly more but acceptable primer flattening, slight bolt imprint.
            Yup, chrony's dead!

            Comment


            • #7
              Range day

              What a beautiful day today was. Glad I made it to the range. The vertical stringing really opened up a few of these groups. All groups were shot at 100 yards.



              1) 1784 19.6 458 SOCOM
              2) 1723 -41.4 IMR 4198 41gr
              3) 1759 -5.4 Sierra FNHP 300gr
              4) 1781 16.6 vert string .5 MOA x 3 MOA
              5) 1775 10.6

              High: 1784
              Low: 1723
              E.S.: 61
              Ave.: 1764.4
              S.D.: 25.1




              1) 1845 0.2 458 SOCOM
              2) 1823 -21.8 IMR 4198 40.8gr
              3) 1865 20.2 Hornady HP 300gr
              4) 1846 1.2 vert string .5 MOA x 2.5 MOA
              5) 1845 0.2

              High: 1865
              Low: 1823
              E.S.: 42
              Ave.: 1844.8
              S.D.: 14.9



              1) 1940 9.2 459 SOCOM
              2) 1932 1.2 IMR 4198 41gr
              3) 1924 -6.8 Barnes TTSX 300gr
              4) 1930 -0.8 1.5 MOA
              5) 1928 -2.8

              High: 1940
              Low: 1924
              E.S.: 16
              Ave.: 1930.8
              S.D.: 5.9



              1) 1977 5 458 SOCOM
              2) 1956 -16 H110 34gr
              3) 1973 1 Barnes TTSX 300gr
              4) 1974 2 Vert string 1 MOA x 2 MOA
              5) 1980 8

              High: 1980
              Low: 1956
              E.S.: 24
              Ave.: 1972
              S.D.: 9.4


              I also shot about 20 rounds I had loaded up with the Berry's 350gr bullet, but I couldn't even get 2 rounds out of 5 on a piece of paper 15x19". Included is the load data for it anyway.

              2) 1692 -5.4 458 SOCOM
              3) 1690 -7.4 IMR 4198 37.8gr
              4) 1692 -5.4 Berry's 350gr
              5) 1714 16.6 MO manhole cover
              6) 1699 1.6

              High: 1714
              Low: 1690
              E.S.: 24
              Ave.: 1697.4
              S.D.: 9.9
              Last edited by ironman; 05-23-2011, 09:57.

              Comment


              • #8
                Great shooting!

                I'm just curious but were you prone or shooting from the bench?

                Comment


                • #9
                  Originally posted by blitzwing View Post
                  I'm just curious but were you prone or shooting from the bench?
                  Shooting off a bench

                  Comment


                  • #10
                    You did not get a box of .452 bullets mixed up with your .458 did you??

                    I know they make both.

                    Comment


                    • #11
                      New brass trimmed/sized/chamfered
                      Barnes 300 TTSX
                      OAL of 2.240"
                      Reloader #7
                      WLP primer

                      I realize three shot strings don't mean much but I'll post the average velocity anyway. Chronograph was ~10’ from the muzzle, 60 degree air temp. 16 ½” PacNor barrel.

                      Listed below is the power charge weight in grains of Reloader #7, the average velocity In FPS, the velocity increase over the previous load.

                      35.0 - 1,635 + 23 (bolt didn't want to lock back)
                      35.5 - 1,658 + 33
                      36.0 - 1,691 + 33
                      36.5 - 1,715 + 24
                      37.0 - 1,747 + 32

                      The Barnes data shows a max load of 37 grains Re #7 for 1,691 FPS in a 16" barrel. I'm 56 FPS over that at the same charge weight.
                      Last edited by JohnOD; 04-28-2011, 17:46.

                      Comment


                      • #12
                        4198 load data

                        i have recently acquired a 16" RRa middy. I have heard that these run best with imr 4198. i see that you have a ladder on your sheet for a 300 grn rem hp.
                        looks like 40.0 grn. to 44.5 grn. i was wondering if you could give a little info on the results of this ladder. accuracy, pressure signs, etc. also primer used and C.O.L. thank you in advance, cant wait to get this thing running.

                        Comment


                        • #13
                          Originally posted by mrallycar2000 View Post
                          i have recently acquired a 16" RRa middy. I have heard that these run best with imr 4198. i see that you have a ladder on your sheet for a 300 grn rem hp.
                          looks like 40.0 grn. to 44.5 grn. i was wondering if you could give a little info on the results of this ladder. accuracy, pressure signs, etc. also primer used and C.O.L. thank you in advance, cant wait to get this thing running.
                          dude I could not get 44.5 grains of 4198 in a shell if I tried(nor would I try) . with 4198 I am runnin 38 grain 2.20 325ftx
                          with lil gun I am running 27 grain 2.12 325 ftx. The lil gun is much cleaner burning.

                          Comment


                          • #14
                            I'm sure some of you fellows may have seen this elsewhere, but I'll post it here:





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                            • #15
                              Anyone try Titegroup for this cartridge?

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