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Two types of Speer 125 9MM Gold Dots

5mmgunguy
Does Speer make two different types of 125 gr Speer Gold Dots? One for the 357 Sig and another for other types of 9MMs? I just bought a box and it says for 357 Sig.
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5 comments

Date Votes
  • 32 Magnum
    Yes. The .357 SIG is a .355 (9mm) bullet in a necked down .40 S&W casing.
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  • 5mmgunguy
    32 magnum...thatks for the info but that doesn't quite answer my question.
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  • perry shooter
    Hello 5MM I suspect the reason is the jacket on the 357 SIG would have to be thicker to expand correctly from the higher velocity of the Sig then say a 9X19 straight 9MM. The bore size may also be different .355 VS .357 You might want to call SPEER customer most bullet comp. will take to users direct [:)]
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  • beantownshootah
    Despite the name, the "357 Sig" actually does NOT use a .357 caliber bullet like the revolver one, but a .356 one, the same as ordinary 9mm luger.

    There is one big reason why the 357 SIG needs its own bullets.

    The rounds are generally pushed 200 fps faster than 9mm luger, and therefore tend to expand faster. A ordinary 9mm luger hollowpoint would expand too quickly at 357 SIG speeds, and would also give up some of the extra penetration, which is one of the main reasons the 357 Sig exists.

    As a secondary reason, the bottleneck cartridge design and brisker recoil of the 357 SIG can promote bullet "walking" or setback within the cases. The round requires a hard crimp so that the bullet doesn't move, and IIRC the 357 SIG bullets are designed to permit this.
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  • 5mmgunguy
    There are two bullets...1 specifically for the 357 Sig and 38 Super it is a .355 diameter, 125 gr bullet and 1 for all other 9MMs. It is .355 diameter, 124 gr bullet. Both gold dots.
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