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Small Pistol Primers for .357 mag?

Discussion in 'Handloading and Reloading' started by V-fib, May 1, 2014.

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  1. V-fib

    V-fib Member

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    Hi, I have some Montana gold 158gr. Jhp's which I would like to load in .357 cases using a start load of 4.5gr 700 X. On searching other threads many say that I don't need a magnum primer using 700 X. I can get my hands on the magnums but already have plenty of regular small pistol primers that I can use. I would be working up to the 5.7gr max of 700 X in the future. So..... could I use the Small pistol primers or should I go with the small pistol magnums?

    Thanks
    V-fib
     
  2. Wil Terry

    Wil Terry Member

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    The standard SPP is perfect.
     
  3. HighExpert

    HighExpert Member

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    With 700x you will not need magnum primers. If you are concerned, get some Winchester primers as they work for both standard and magnum apps.
     
  4. USSR

    USSR Member

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    There's just a handful of powders that require magnum pistol primers in .357 Magnum loads. It's the powder make that determines it, not the cartridge designation.

    Don
     
  5. MtnCreek

    MtnCreek Member

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    If I'm not mistaken, I believe Win Small Pistol primers come in both Standard and Magnum. Their Large Pistol Primers are Standard/Mag combined into one.
     
  6. kcofohio
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    kcofohio Member

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    MtnCreek is correct. Winchester has WSP & WSPM. Their WLP they say are good for both regular and magnum loads.

    Never have used any 700x yet, but I have used non magnum primers in 357 with Titegroup and W231. The powders both did well.

    I believed you would want magnum primers if you were to use slower powders as AA #9 or 2400.
     
  7. ArchAngelCD

    ArchAngelCD Member

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    As said above, SPP are just fine because your powder doesn't require a magnum primer. Hard to ignite ball powders like H110 / W296, HS-6 and HS-7 should be set off by a magnum primer.

    Load them up without worries...
     
  8. buck460XVR

    buck460XVR Member

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    Alliant, manufacturer of 2400 recommends against the use of magnum primers with 2400 and claims that standard primers give more consistent ignition.
    HS-6, HS-7, H110/W296 do require Magnum primers for .357 mag.
     
  9. CraigC
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    CraigC Member

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    Exactly!

    Far as I know, the WSP and WSPM are the same primer in different packaging.
     
  10. Bud0505

    Bud0505 Member

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    I've been using AA#9 for years as my "full magnum" load and have always used SPP. It provides me with all the bang I'll ever need or want in a .357 mag. Have never had a failure to fire.
     
  11. zxcvbob

    zxcvbob Member

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    SP primers are perfect. You can use SPM's in a pinch.
     
  12. 2zulu1

    2zulu1 Member

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    Packaging WSP/WSPM, different internal component color so I'm assuming different primer. :)

    Also, small rifle primers can be substituted for mag primers if needed.
     
  13. kcofohio
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    kcofohio Member

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    Buck, thanks! Hadn't seen that one.
     
  14. V-fib

    V-fib Member

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    Thanks all for the useful info!:cool:

    V-fib
     
  15. JLDickmon

    JLDickmon Member

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    I'm not sure about that one.. I think they are different heights
     
  16. mahansm

    mahansm Member

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    Small pistol and small rifle are the same diameter and height. Large rifle are about .007 inch taller than large pistol. I have no specific knowledge of the relative energies of small pistol magnum and small rifle.

    Yesterday at the range I fired a bunch of .357 mag rounds loaded with 125 grain hollowpoints and about 16 grains of 2400. Winchester small pistol primers (not magnum) lit all of them very nicely out of my 686.
     
  17. V-fib

    V-fib Member

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    JL,

    Are you thinking the SPP and the SPMP are different heights or that the small rifle primers are different from the PP heights. would be good to know.

    v-fib
     
  18. V-fib

    V-fib Member

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    mahansm,

    looks like we were typing at the same time:D

    v-fib
     
  19. dragon813gt

    dragon813gt Member

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    Yes, they can but proper load reduction and work up is called for. Probably not a big deal w/ light loads. But if you are at or close to max you need to work it back up properly. I don't own and SPM primers and use SR exclusively. But they were worked up and all the firing pins are strong enough to set them off.
     
  20. PO2Hammer

    PO2Hammer Member

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    Just for fun, a chart of CCI primer energies, may be a few years old.
    [​IMG]
     
  21. BYJO4

    BYJO4 Member

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    As others have already said most powders for 357 use SP primers. The reloading data that you are using will indicate what primer is to be used.
     
  22. Catpop

    Catpop Member

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    All I've ever used with unique and 2400- last 41 years!
     
  23. RainDodger

    RainDodger Member

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    In ~45 years of hand loading, I don't think I've ever used a magnum small pistol primer in a .357 load. :) Haven't had a problem so far.

    Edit: I'm looking at trying some loads that call for them too, but there are none around here anyway, so I'll be using standard SP primers. I don't anticipate problems.
     
  24. kcofohio
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    kcofohio Member

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    Several of loads listed on Hodgdon's site show Winchester SPM primers for their loads. Alliant does list CCI 500 for 2400 & Bullseye loads.

    I loaded some 2400 @ 12 gr. with magnum primers and a
    158 gr. SWC. Think I'll do the same with SPP's and see if I can tell a difference.
     
  25. fecmech

    fecmech Member

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    PO2 --Interesting chart you posted. A few years back during the first big primer shortage I was unable to get SPP's and had to use CCI SR's. Using a chronograph I noticed little to any difference with faster pistol powders in the .38/.357. One benefit of the shortage was that I found that the CCI SR primers did a much better job with my magnum loads of 296 and WC820. I went from SD's in the mid 20's to single digit SD's and a corresponding accuracy improvement. My experience with 2400 in the .357 is standard SPP's work just fine and for me give better internal ballistics.
     
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