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Thread: .357 sig mold options

  1. #1
    Boolit Mold
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    .357 sig mold options

    What are some of the best mold options for the .357 sig ?

  2. #2
    Moderator Emeritus


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    Take a long hard look at the neck and ask yourself how stable a bullet would be held by it. I find that cartridge rarely mentioned in any reloading manual with cast. High pressure like 9mm and 40/10mm with out the stability of a straight wall case.
    [The Montana Gianni] Front sight and squeeze

  3. #3
    Boolit Bub
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    I have been using the Lee 358-125-RF bullet, coated, sized to .356". Seated at 1.143 I can use the crimp groove and give it a slight roll crimp to ensure no bullet set back. I worked up a load using AA#5. Started at 8.0 gr. up to 8.8 gr. Western powders listed 8.8 gr. as max with a 125 gr. FN. Settled on 8.6 gr. as a good load. Shot out of a M&P 4".

  4. #4
    Boolit Mold
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    I liked the Lee 358-125-RF ,but wondered about a bullet mold that had straight sides like a NOE mold. Just not sure of mold number like that.

  5. #5
    Boolit Grand Master
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    Were I to go that direction, I would try an NOE HTC359-129-TC, and powder coat. However. I have to say that none of the rounds I have reloaded for my Sig 229 were cast. I am a little too concerned over the possibility of bullet setback causing an over-pressure event and damaging me or the pistol.
    _________________________________________________It's not that I can't spell: it is that I can't type.

  6. #6
    Boolit Mold
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    I powder coat all my cast boolits now. I'm mainly looking for a good cast boolit mold for plinking .

  7. #7
    Boolit Master
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    This is the one I use. TL356-124-TC
    https://leeprecision.com/mold-dc-tl356-124-tc.html.

    I powder coat mine and have easily pushed them to 1300 FPS, haven't tried any faster, but they have been perfect. I also use the Lee FCD die for .357 sig which is the collet type crimper. Never had any setback issues.

    Rosewood
    Evangelical, deplorable redneck and proud of it.

  8. #8
    Boolit Buddy
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    I've used this Saeco mold since day one, for 357 SIG & 9MM 122-GR TCFP-BB, SAECO TWO CAVITY #377 MOULD.
    Never had a feed issue. With the TC nose there is sufficient bullet bearing surface which you need for this case.
    Any round nose bullets loaded on the bearing surface will result in the O.A.L. being well over the maximum of 1.140".

  9. #9
    Boolit Mold
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    I powder coat all my cast boolits now. I'm mainly looking for a good cast boolit mold for plinking .

  10. #10
    Boolit Mold
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    I think the TL356-124-TC is a good choice for me. I can use it on my 9mm and .380 .
    Thanks Rosewood

  11. #11
    Boolit Master
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    Quote Originally Posted by rosewood View Post
    This is the one I use. TL356-124-TC
    https://leeprecision.com/mold-dc-tl356-124-tc.html.

    I powder coat mine and have easily pushed them to 1300 FPS, haven't tried any faster, but they have been perfect. I also use the Lee FCD die for .357 sig which is the collet type crimper. Never had any setback issues.

    Rosewood
    What’s your OACL with that boolit? Might not fit in all magazines.

  12. #12
    Boolit Master
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    Don't remember, but it works fine. The boolit has a long bearing surface and allows you to seat deeper than a round nose boolit. Works in my p229 and s&w sigma, and glock 33.

    Rosewood
    Evangelical, deplorable redneck and proud of it.

  13. #13
    Boolit Master
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    I haven't tried in 380, but a 124 is heavy for a 380, will not have much room for powder.
    Last edited by rosewood; 12-31-2022 at 10:32 PM.
    Evangelical, deplorable redneck and proud of it.

  14. #14
    Boolit Master
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    Pics.

    1.145"oal
    Attached Thumbnails Attached Thumbnails 910202113203.jpg  
    Evangelical, deplorable redneck and proud of it.

  15. #15
    Boolit Mold
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    Has anyone tried the LEE PRECISION 356-120-Tc 6 Cavity Bullet Mold in the sig ?

  16. #16
    Boolit Master
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    Quote Originally Posted by rosewood View Post
    Pics.

    1.145"oal
    Winner!

  17. #17
    Boolit Bub
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    Quote Originally Posted by rosewood View Post
    Pics.

    1.145"oal
    Lookin' good!

  18. #18
    Boolit Master
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    I use Smokes clear powder coat. No smoke and no leading at over 1300fps.
    Evangelical, deplorable redneck and proud of it.

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check