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357 Sig reloading data

Discussion in 'Handloading and Reloading' started by SteelManCM, Dec 2, 2010.

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  1. SteelManCM

    SteelManCM Member

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    Looking for some reloading data for 357 Sig. I use bullseye powder and cast my own bullets. I can size my 9mm casts to .355 without an issue. Will I need to get new dies? How many grains of powder. I haven't found much at all on this caliber. Thanks in advance for any help.
     
  2. DFisher3112

    DFisher3112 Member

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    http://data.hodgdon.com/main_menu.asp

    That should give you all the information you need for every powder and bullet made. As for cast bullets, Im not sure. As for the dies, you will need a new set.

    DFisher3112
     
  3. SteelManCM

    SteelManCM Member

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    Wow. Don't know how I missed this. GREAT site! Thanks.

    Kinda figured about the dies, but had to ask. Thanks for the resource.
     
    Last edited: Dec 2, 2010
  4. 68wj

    68wj Member

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  5. SteelManCM

    SteelManCM Member

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    Thanks. Happy reading to me. I tried the search before I asked, I guess I need to get more proficient.
     
  6. DFisher3112

    DFisher3112 Member

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    No problem! I'm glad that I could help!
     
  7. skipjack

    skipjack Member

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    Before sizing your bullets to .355, slug the barrel of your
    pistol, and size .001 over the groove diameter. You will
    save yourself from experiencing leading, or at least, you
    will have minimal leading.
     
  8. SteelManCM

    SteelManCM Member

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    Nice tip. Although, generally, if I find a round I like, I have more than one gun in that caliber. I guess the best would to be to slug them all and average it out. You've got me thinking. Thanks for that.
     
  9. JimKirk

    JimKirk Member

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    Are you asking if you need new dies to load the 357 SIG ... if you do not have any ... then, yes you will.

    If you are asking if you need different dies to load 357 SIG LEAD... then no... if you already have a set of 357 SIG dies. You may need a different bullet seating stem with a profile to match the lead bullet better ... then you may not either.

    http://www.alliantpowder.com/reloaders/default.aspx
    http://www.accuratepowder.com/reloading.htm
    http://www.lapua.com/fileadmin/user_upload/esitteet/VihtavuoriReloadingGuideEdition8.pdf

    Jimmy K
     
  10. SteelManCM

    SteelManCM Member

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    Yeah, I guess I gave incomplete information. Sorry. I currently load:

    .32ACP
    .380ACP
    9mm
    .38/.357
    .40S&W
    .44sp/.44Mag
    .45ACP/.45LC

    I know that the .357Sig uses the "same" (.355 vs. .356) projectile as the 9mm, but due to the bottleneck of the cartridge, I believe new dies are necessary. Although, if they are not, then I can get started sooner.

    Thanks again for the information.
     
  11. skipjack

    skipjack Member

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    You will need a set of dies, also you will need to lube the cases
    because of the bottleneck. I use imperial sizing wax, and a little
    goes a long way. You can get it at Midway or other online vendors.

    I have also used Hornady One shot...but I am cheap, so the Imperial
    gets the nod.

    Data for lead is a bit scarce. Most data shows jhp bullets, which
    are much stronger than lead or plated bullets. You will probably
    need to keep velocity under 1200, unless your bullets are sized
    properly.

    Which mold are you casting? I have shot the Lee 120
    truncated cone out of my 38 super and 9mm. It is accurate in
    both guns. I can shoot them as cast...they are falling at .3565
    to .357. As cast diameter, as I am sure you know, will vary based
    on your alloy, etc.
     
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