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Advice please on .357 mag load

Discussion in 'Reloading' started by G23, Apr 9, 2011.

  1. G23

    G23 Millennium Member

    Nov 5, 1999
    I'm considering assembling the following .357 magnum load. They would be fired through a Ruger New Model Blackhawk 4 5/8" barrel chambered in .357 magnum.

    Remington .357 magnum cases, Winchester 158 grain JHP bullets, Winchester small pistol primers, 14.0 grains of Alliant 2400 powder.

    Will this load be safe in the above named revolver? Any guestimate of velocity? Any other good load suggestions using 2400 and the 158 grain JHP? Thanks to all for their help! :wavey:
  2. NMG26


    Jul 24, 2010
    I just bought the same Gun!

    Just getting into reloading so I'm paying attention to these types of threads.

    Free bump

  3. mnhogrider


    Sep 10, 2007
    My Speer manual is showing 158 gr GDHP using 2400 at a starting charge of 13.8 gr @ 1128 ft/sec. Max charge 14.8 gr @ 1265 ft/sec.

    I'd start at the 13.8 and work up.
  4. GioaJack

    GioaJack Conifer Jack

    Apr 14, 2009
    Conifer, CO
    2400 works best at the top end and the Blackhawk is designed to handle it. If you decide you want to start loading some in the mid-range area forget about the 2400, you'll get a lot of unburned powder... switch to Unique for those loads.

  5. WiskyT

    WiskyT Malcontent

    Jun 12, 2002
    North Carolina
    That load will be fine. You'll be somewhere around 1200fps. That load will also work well with a cast 158. You'll get a little more velocity with the same amount of powder and a cheaper load.

    Jack's right about Unique for lighter loads. Your 2400 load will have a noticable amount of recoil, but it won't be punishing.
  6. Zombie Steve

    Zombie Steve Decap Pin Killa

    May 31, 2007
    Old Colorado City
    I go to 14.6 grains 2400 with Starline Brass and a federal magnum sp primer. 158 grain XTP 1.580" OAL.

    Right at 1,250fps from my 4" 686. This was right from Lyman 49. I had taken it a bit higher with Winchester brass (14.8 grains). Go slow and work up.

  7. dudel


    Dec 10, 2008
    Texas Hill Country
    Funny you should ask. Just picked up a Taurus 608 (8 3/8" ported barrel). It's nice not to chase brass. My previous 357 Mag loads had been with H110. I switched to 2400 on a tip from a fellow GTer.

    Standard primers, 158gr JHP w/cannalure. RP brass. Started with 13 gr of 2400. Did not get a chance to chrono them yesterday, but some test shots showed good accuracy and very, very clean. No unburnt powder. A nice change from H110. I'll do further workup to see what advantage can be gained over 13gr; but for now, I'm pleased with what I see with 2400.
  8. G23

    G23 Millennium Member

    Nov 5, 1999
    At this point I'm thinking that I'll load rounds using the 158 grain JHP and 2400 powder as follows: 13.0 grains, 13.5 grains, and 14.0 grains.

    Alliant Powders website shows the max charge with a 158 grain Gold Dot JHP is 14.8 grains. I'll start by test firing the lightest charge and work up. If I need to discontinue before I reach the heavier loads I can use a bullet puller and disassemble the remaining rounds.
    Last edited: Apr 10, 2011
  9. fredj338


    Dec 22, 2004
    That's called working up your load. The correct way to go about it.:supergrin: