7MM Rem Mag, H4350, and 154gr SST's starting point?

Discussion in 'Reloading' started by blm771, Apr 29, 2013.

  1. blm771

    blm771 Member

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    I am looking for a good starting point for a 7mag using H4350 and 154gr hornady SST. I have loaded up 5 so far with 58gr of H4350 and CCI mag primers, but have not shot it yet. am i on the right track on this one or should I pull them and start over. I would appreciate all of your thoughts in this matter. gun)

    Brian
     
    Last edited: Apr 29, 2013
  2. tomt

    tomt Well-Known Member

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    H-4350 will work, but not as good as other powders. 58 gns of H-4350 has a case filing ratio of 87-88%. A slower powder would be better. Quickload is showing about 50,000 psi. RL-22 worked well in a friends 7mm Rem Mag.
     

  3. blm771

    blm771 Member

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    Thanks for the reply, I'm still kinda new to the reloading thing so please bear with me. At 87-88% fill with 58gr of H4350 I have some room to go up a little bit for more speed possibly correct? I do have some RL19 as well, what are your thoughts on that?
     
  4. tomt

    tomt Well-Known Member

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    A general but not hard fast rule is to have case capacity at 95-100%. This typically gives best accuracy. A slower powder will probally improve velocity and accuracy.
     
  5. blm771

    blm771 Member

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    Ok, I now have some results of my loads.

    *NOTE* Speeds are based on factory ammo posted velocity on cheap federal box of 3110fps with 150gr hot cores hitting at the same height as hand loaded ammo on average @ 100yds.

    58gr loads did pretty good with .960" 5 shot group at about 3000fps

    59grn of h4350 yielded a 3 shot group of .4660" at again about 3000fps :)

    60gr opened up enough that i did not even want to measure it...lol

    so that having been said i believe the winner is the 59gr load of H4350 with the 154gr Hornady SST's should make a decent Elk round within reasonable distances, don't y'all think?
     
  6. meat head

    meat head Well-Known Member

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    yes,but try 58.5 may tighten even more my old load now im shooting H-1000 68 grn. 150 sierra match king
     
  7. Clark

    Clark Well-Known Member

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    Some of my measurements:

    150 gr Ballistic tip moly 3.4" 66 gr H4350
    3259 fps
    3375 fps
    3333 fps


    Work up
    Hodgdon web site:
    162 gr HDY SPBT H4350 3.290" 58.0 gr 2799 fps 49,400 CUP

    My work up H4350 162 gr interlock moly 3.34"
    62.8 gr ok difficult primer insertion
    65 gr ok difficult primer insertion
    66. 5 gr ok difficult primer insertion
    67.0 gr ok difficult primer insertion
    67.5 gr easier primer insertion ...end work up


    What does it all mean?
    Backing off 4% powder charge from highest long brass life load would be 64.3 gr which is 11% higher than max published load.

    There are white lies, lies, damn lies, and then there is 7mmRM published load data.
     
  8. Beluebow

    Beluebow Well-Known Member

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    Published load data isnt for moly bullets its a whole differant ball game.Which I'm sure you know just throwing that out there.
     
  9. 7 loader

    7 loader Well-Known Member

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    What did your book(s) say? sorry guys.gun)
     
  10. Edd

    Edd Well-Known Member

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    It means you should be using H1000.
     
  11. freebird63

    freebird63 Well-Known Member

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    I shoot a 280 Ackley Improved, it seems to like IMR 4350, H4831SC, H1000 and Retumbo. A friend uses Ramshot magnum powder.
     
  12. blm771

    blm771 Member

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    Here is the pic of the best results i had. I estimate the speed to be closer to 2900 than 3000...just guessing as i did not have a chrony at the time. should have stopped at the 3rd shot. pretty sure the 4th one was because of me and not the load.
     

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