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Thread: Looking for corroboration of 1969 7 mm mag loads using 4831

  1. #1
    Boolit Master

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    Looking for corroboration of 1969 7 mm mag loads using 4831

    I was cleaning out my misc ammo storage locker and came across 9 boxes of dadís 7 mm Rem Mag reloads. Some of the brass is well tarnished and some not to bad. There are two different loads, both used H4831 powder.

    One was a 154 grain Hornady jacketed bullet overtop 69 grains of 4831.
    Other was a 175 grain Hornady jacketed bullet over 64.5 grains of4831.

    If anyone has a 1969 era load data book Iíd appreciate knowing if these loads were within manufacturerís limits back then. Sorry I canít be more specific regarding the bullet type. That was a detail dad didnít find important.

    I checked on Hodgdon load site and both loads exceed the maximum recommended charge. Now Dad was a brilliant self- made man with possibly the worst penmanship Iíve ever seen. I never used his rifle reloads but know for a fact his shot shell loads were often brutal. I will always honor his memory but prefer to do so with all my body parts intact.
    I have a few alternatives.
    I can pull them down and salvage components or
    Clean them up and use them, providing the charges donít exceed the published load data for that time period.
    Thanks

  2. #2
    Boolit Grand Master

    Winger Ed.'s Avatar
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    I'd pull 'em down, lighten the load a bit, and put 'em back together.
    Something that might tell you a little more about them is if you can find a fired case or two.

    Besides the other considerations--- max. or over loads usually aren't very accurate anyway.
    In school: We learn lessons, and are given tests.
    In life: We are given tests, and learn lessons.


    OK People. Enough of this idle chit-chat.
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    EVERYONE!
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  3. #3
    Boolit Master

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    Thank Ed. Youíre of course correct about max load accuracy. Just wondered since others have frequently commented that manufacturers are more conservative with load data these days. Pulling them down does seem to be the smarter option.

  4. #4
    Boolit Buddy
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    Been shooting a 7 Mag since ‘73 using H4831 and the 154 gr Hornady SP. I never loaded that hot. So I’d pull them, especially given the age of the ammo

  5. #5
    Boolit Grand Master

    Winger Ed.'s Avatar
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    I'm big on accuracy, and don't ever seem to shoot out past about 200 yards.
    Of the 7mm and .300 belted Mags I've had in the past, I never really had the need for their full potential.

    Even with the new generation books, I find myself loading at around 80-90% of their max. listings.
    It works for me and I think it saves a little wear and tear on barrel throats and locking lugs.
    In school: We learn lessons, and are given tests.
    In life: We are given tests, and learn lessons.


    OK People. Enough of this idle chit-chat.
    This ain't your Grandma's sewing circle.
    EVERYONE!
    Back to your oars. The Captain wants to waterski.

  6. #6
    Boolit Buddy
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    Lyman 45th edition
    154gr jacketed 4831 66gr max
    175gr jacketed 4831 65gr max

  7. #7
    Boolit Master

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    Thanks for the input guys!

  8. #8
    Boolit Bub
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    If in doubt, pour it out.

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  9. #9
    Boolit Master

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    From my older manuals. Max loads of H4831

    Hornady 1973
    Rem 700 rifle
    154 gr 69.1 gr. 175 gr 64.9

    Speer 1967
    Rem 700 rifle
    160gr 67gr. 175gr 64gr

    Speer 1974
    savage 110 rifle
    160 gr 60gr. 175 gr. 58 gr

    Speer dropped their max loads dramatically from 1967 to 1974.
    Is it the difference in the rifles?

    I`m not sure this is much help to you but this is what I found.

  10. #10
    Boolit Master

    dale2242's Avatar
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    From my older manuals. Max loads of H4831

    Hornady 1973
    Rem 700 rifle
    154 gr 69.1 gr. 175 gr 64.9

    Speer 1967
    Rem 700 rifle
    160gr 67gr. 175gr 64gr

    Speer 1974
    savage 110 rifle
    160 gr 60gr. 175 gr. 58 gr

    Speer dropped their max loads dramatically from 1967 to 1974.
    Is it the difference in the rifles?

    I`m not sure this is much help to you but this is what I found.

  11. #11
    Boolit Grand Master


    Larry Gibson's Avatar
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    Quote Originally Posted by dale2242 View Post
    From my older manuals. Max loads of H4831

    Hornady 1973
    Rem 700 rifle
    154 gr 69.1 gr. 175 gr 64.9
    Found the same plus from Hodgdon's Data manual #22 (1974)

    Max load with 154 gr bullet using 4831 is 68 gr at 55,100 CUP.

    Max load of 4831 with 175 gr bullet is 63 gr at 53,800 CUP.
    Larry Gibson

    ďDeficient observation is merely a form of ignorance and responsible for the many morbid notions and foolish ideas prevailing.Ē
    ― Nikola Tesla

  12. #12
    Boolit Master

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    Quote Originally Posted by Larry Gibson View Post
    Found the same plus from Hodgdon's Data manual #22 (1974)Max load with 154 gr bullet using 4831 is 68 gr at 55,100 CUP.
    Max load of 4831 with 175 gr bullet is 63 gr at 53,800 CUP.
    Iím going to pull them down. Not worth the risk. Thanks to all.

  13. #13
    Boolit Master MarkP's Avatar
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    Quote Originally Posted by dale2242 View Post
    From my older manuals. Max loads of H4831

    Hornady 1973
    Rem 700 rifle
    154 gr 69.1 gr. 175 gr 64.9

    Speer 1967
    Rem 700 rifle
    160gr 67gr. 175gr 64gr

    Speer 1974
    savage 110 rifle
    160 gr 60gr. 175 gr. 58 gr

    Speer dropped their max loads dramatically from 1967 to 1974.
    Is it the difference in the rifles?

    I`m not sure this is much help to you but this is what I found.
    Testing methods;

    Pressure barrels changed from copper crusher (CUP) to Piezo (psi) with Piezo you would see peak pressure, CUP is a small copper cylinder that sits on top of a piston and between an anvil, when the cartridge is fired the case vents gas thru the hole in the chamber and pushes the piston upwards thus crushing the copper cylinder.
    Each lot of copper cylinders will have calibration chart in the box. The final height of the crusher corresponds to a CUP value. So a shorter crusher = higher pressure or higher CUP value. This system would not see a tall narrow spike in pressure, 7 mm Rem Mag is one cartridge that was reduced somewhat.

  14. #14
    Boolit Buddy
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    Click image for larger version. 

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    From the 1979 Speer manual.

  15. #15
    Boolit Buddy
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    Click image for larger version. 

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