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MBC 9 cone or 9 SWC for 357 Sig?

Discussion in 'Handloading and Reloading' started by Dewey 68, Apr 8, 2019.

  1. Dewey 68

    Dewey 68 Member

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    Has anyone used either of these bullets for loading 357 sig?
     
  2. RugerOldArmy

    RugerOldArmy Member

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    They are only .356", and for .357 Sig, you should be looking for .358" caliber bullets.

    I haven't tried that, but I would expect accuracy to suffer.

    I don't know that I'd recommend this, but given the proper projectile weight and load, I'd suspect that you would get much better results loading .358" bullets in 9mm, if your cartridges passed the 'plunk test'.
     
  3. Dewey 68

    Dewey 68 Member

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    Hmmm......everything I've read shows they use 9mm bullets.
     
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  4. Chillydog

    Chillydog Member

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    Yes, .355 aka 9mm. Truncated cone. Round nose typically won’t work in the short neck of the sig case.
     
  5. Walkalong

    Walkalong Moderator

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    You're looking for a long bearing surface on "9MM" bullets for use in the .357 Sig.

    I do not load it, nor have I seen either of the bullets in question, but we have some .357 loaders here who can give good suggestions.
     
  6. JimKirk

    JimKirk Member

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    Sorry ....I cannot be of any help with the loading lead or coated bullets in the 357 SIG...

    I did just order a thousand RMR 124 grain JHP MPB .... They sure are nice looking Jacketed bullets for just a couple cents more per bullet over the MBC bullet ....

    MBC are great bullets .... I am sure there are folks loading lead .... I'd rather stick with jacketed for the SIG.....
     
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  7. RugerOldArmy

    RugerOldArmy Member

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    You're correct. Ignore my comments. I looked up .357 Sig, it is designed for .355 bullets (cast would be .356). I was in error in assuming, given the name of the cartridge, that they called for .357 bullets (cast being .358)...like .357 Mag.

    My apologies.
     
  8. Dudedog
    • Contributing Member

    Dudedog Contributing Member

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    I don't load it but people have reported good results with the Rocky Mountain Reloading 124gr MPR in .357 Sig. (assuming HPs are legal where you are)
    Check out some of vaalpens threads for loads.
    RMR offers THR members a 5% discount and has free shipping.
    Code is THEHIGHROAD5 and your screen name. (can't remember if it needs to be upper or lower case)

    In 9mm my pistolsI liked the MBC cones much better than the SWCs
     
    Last edited: Apr 11, 2019
  9. Chillydog

    Chillydog Member

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    Sorry, I should have put more details in my earlier post. I have loaded the Montana Gold 125 JHP, RMR 124 flat point match winner. Both have a long bearing surface and work well in the 357 Sig. I have loaded with 8.3 of Longshot puts them right at 1400fps in my experience.

    I wouldn’t load lead or regular plated to this level but I’m fairly new to reloading and only say that based on what I have read.

    Downloading the Sig brings it back to 9mm power levels, kinda defeats its purpose and you might as well load 9mm brass that is cheaper and much easier to find. Just my thoughts and worth the price paid.

    Gary
     
  10. Dewey 68

    Dewey 68 Member

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    With free shipping and a discount for THR members there isn't any reason not to use the bullets from RMR. Thanks for the tip. I was going to order some bullets for 44 magnum from MBC so I figured I'd ask. I haven't loaded for 357 Sig yet but I definitely want to load them to normal 357 velocities, like Chillydog said above, doesn't make sense to download them.

    Thanks for the replies.
     
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