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357 Magnum Primer Question using H110, IMR 4227 or Unique

Discussion in 'Handloading and Reloading' started by Tempus Tom, Dec 19, 2020.

  1. Tempus Tom

    Tempus Tom Member

    Joined:
    May 5, 2020
    Messages:
    70
    Location:
    Las Vegas
    Hey friends,

    I am relatively new to reloading and want to load some 357 magnum ammunition for my father as a Christmas gift. I have not previously loaded for this caliber.

    I will be using Hornady 125 grain XTP bullets and according to my Hornady manual, all of the loads require SP magnum primers. All I have are CCI #500 SP primers.

    However, in my Lee manual, it has data for the 125 grain XTP using Unique powder. And it doesn’t appear that this load requires magnum primers.

    The powders I currently have that may be useful for this application are H110, IMR 4227 and Unique.

    Out of those three powders, I need to use Unique, correct? (Since I do not have SP magnum primers)

    Any help would be greatly appreciated. Thank you.



    Brass: Mixed
    Bullet: Hornady 125 grain .357” / 38 cal
    Powder: I have IMR 4227, H110, Unique
    Primers: Only have CCI #500
     
  2. Rod47

    Rod47 Member

    Joined:
    Aug 3, 2017
    Messages:
    138
    That would be your best choice.
     
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  3. Blue68f100

    Blue68f100 Member

    Joined:
    May 25, 2011
    Messages:
    7,083
    Location:
    Piney Woods of East Texas
    Unique is fine with std primers.

    H110/W296 require Mag Primer with a heavy crimp. Powder good only for full house magnum loads.
     
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  4. Obturation

    Obturation Member

    Joined:
    Dec 24, 2018
    Messages:
    3,345
    Location:
    Northern illinois
    You got it. Won't get the best velocity with unique but the spp will do fine.
     
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  5. Tempus Tom

    Tempus Tom Member

    Joined:
    May 5, 2020
    Messages:
    70
    Location:
    Las Vegas
    Thanks guys...just wanted to make sure I correctly understood what I was reading.
     
  6. Charlie98

    Charlie98 Member

    Joined:
    Nov 20, 2017
    Messages:
    4,938
    Location:
    McKinney, TX
    Although I also recommend Unique, IMR4227 doesn’t necessarily require Magnum primers.
     
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