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Load Data for Sierra JSP 158 g (38 spcl/.357 magnum)

Discussion in 'Handloading and Reloading' started by Keeperfaith, Nov 8, 2012.

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  1. Keeperfaith

    Keeperfaith Member

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    Hello all, I just bought some Sierra JSP 158grain bullets for 38 special/357 magnum.

    I got home and found no data for these bullets in my Lymans 49th or Lee manual.

    Anyone have any load data for this bullet?? (preferably with HP-38/Win 231, Alliant 2400, or Accurate No.2 powder, Thats what I have).

    Thanks in advance,

    Steve
     

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  2. oneounceload

    oneounceload member

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    If you have data for 158 JHP, it will work. I used to load a lot of those when they were cheap and my older Sierra manual has data, but it is many years old and not up with current powder blends
     
  3. Hondo 60
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    Hondo 60 Member

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    If they were mine, I'd use the data for a 158 GR. HDY XTP.

    Just start low & work up
     
  4. ArchAngelCD

    ArchAngelCD Member

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    There you go, use JHP load data and crimp in the crimp groove.
    You will get good results with W231/HP-38 in the .38 Special and 2400 in the .357 Magnum.
     
  5. Steve C

    Steve C Member

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  6. Mr.Revolverguy

    Mr.Revolverguy Member

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    Sierra says

    w231 7.0-7.7
    AA#2 6.6-7.5
    2400 14-15

    AA#7 being the most accurate load 11.4gr
     
  7. bds
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    bds Member

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    Current Alliant load data

    From 2004 Alliant load data

    [​IMG]


    Here's current Hodgdon load data

    From 1999 Winchester load data

    [​IMG]
     
  8. ArchAngelCD

    ArchAngelCD Member

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    Can you tell me what year that Sierra load data is from?
     
  9. 41 Mag

    41 Mag Member

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    Usually, but not always, with any given bullet weight, if you have listed data for that particular weight, you can cross reference, and substitute another bullet of the same weight using that data.

    The kicker is, some of the newer copper bullets like Barnes, the Hornady XTP, and some variations of cast. The issues with the jacketed or solid type are that the XTP has a harder core and jacket than other standard cup and core JHP's, and the Barnes, well being solid, these types will bump up the pressures due to their resisting the rifling a bit more than a standard C&C type bullet.

    With the cast bullets, it all depends on the particular dimensions of the bullet. They can have a longer base on them, which when seated consumes more of the case than a similar weight jacketed, and therefore will raise pressures. Hardly any cast bullet will be as hard as a jacketed, and IF the shank, or base below the crimp groove, are close to or the same as what is found on a jacketed of similar weight the same STARTING LOAD DATA can usually be used to work up loads for them as well, depending on the BHN. If the bullet has a low BHN (6-10), velocities need to be kept low @ 1100fps or less, but most anything above a 12-14 BHN can usually be driven to mag velocities depending on the fit of the bullets to the particular bore of the firearm. Usually with standard weight for caliber cast bullets this is the case, however with some of the now popular copper plated bullets, even if the hardness is there, they should not be pushed much if any over around 1100fps due to the copper plating being stripped off the lead.

    The last thing would be that faster powders jump up pressures more quickly and can in some cases ruin an otherwise good load or worse, where the mid ranged and slower powders might not be quite a clean burning, but they are MUCH more forgiving when working with a new load. The exception would be H-110/296 where the reducing loads are not recommended.
     
  10. KevinR

    KevinR Member

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    14.8 GR 2400 / WSP / 158 Gr Sierra JSP / No Crimp / 1.59OAL / 1700FPS / H&R Single Shot Rifle
    (Use with caution!!) Lyman Lists this as a MAX Load and it is. Burning holes in about 10% of primers. But it is a Deer Load so I don't go through many of them.
     
    Last edited: Nov 10, 2012
  11. Steve C

    Steve C Member

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    The Loadbook was published in 1993.
     
  12. gamestalker

    gamestalker member

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    Mr. Revolverguy's Sierra data is consistent with my Sierra data that is from 2002, so your good to go.

    And if you are loading with a simular bullet of different jacketed bullet make, but all else is the same, it is generally OK to use existing data to cross refrence from, I do it from time to time without problems.

    GS
     
  13. SSN Vet

    SSN Vet Member

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    I can tell you with a great deal of certainty that you will NOT like this load...

    Try it and you will learn the definition of SNAPPY first hand.... and then proceed to rub the palm of your shooting
    hand.

    14 gr of A2400 is becoming one of my favs
     
  14. Miata Mike

    Miata Mike Member

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    I found using 2400 powder to be very satisfying. Neat fire ball too if I remember right.
     
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