Privacy guaranteed - Your email is not shared with anyone.

Article The .357 SIG

By Overkill338, Jan 30, 2017 | Updated: Jan 30, 2017 | | |
  1. Overkill338
    The .357 SIG wasn't the first bottleneck handgun cartridge. In the 1960's Winchester necked the .357 Magnum down to to .257.Then the 9x25 Dillon came along in 1988 by necking the 10mm Auto down to .355". Finally in 1994, SIG Sauer and Federal with a joint venture, shorterned and necked down the 10mm to create the .357 SIG. Some think you can form it using .40 S&W brass, but the .40 is 0.009" shorter than the .357 SIG.


    The idea of this cartridge was to try to match the 1450 feet per second 125 grain .357 Magnum, which is #1 in 1 shot stops in history. In a 4" barrel service pistol the Speer 125 grain Gold Dot .357 SIG is advertised at 1350 feet per second. Federal HST 125 grain 1360 feet per second. These two listed loads are two of the best we have to use in .357 SIG and I would feel confident with either, but Im a long Gold Dot fan. In chronograph comparisons I was able to find, you get 3%-4% more velocity when using a 4.5" Glock 31.

    357 2.png

    While it is not EXACTLY a .357 Mag, the .357 SIG has proven itself to be a very capable cartridge. Its very effective at barrier penetration (windshields,car doors, etc). Several Police Agencies have adopted it. The Virginia and North Carolina State Police, and even our local Sheriff's departments. As its popularity has risen with LEA's, its also became more popular as a personal defense caliber. Recoil is very comparable to a .40 S&W, just not as snappy. I'd take the .357 SIG over a .40 any time. Id also carry Underwood Ammo's 125 grain Gold Dot, thats advertised at 1475 fps and 604 ft/lbs, which gives you an amazing proven bullet at the original 357 Mag speed. They also offer a 147 grain XTP at 1250fps & 510 ft/lbs.

    If you have not tried the .357 SIG, you really should. For us Glockaphiles, its as easy as a barrel from Lonewolf and your 22/23/27 can be a 31/32/33 no magazine change needed. Also the 10mm Glocks can be converted to .357 SIG with just a barrel, but the 10mm can also be a 9x25 which Im considering for my own G29 if I can find a bullet that can hold up to the speeds.

Recent User Reviews

  1. Awan
    "Good Information"
    Thanks for this article. I have been contemplating purchasing the G32 and this article may have sold me. Hickcok45 has a couple of videos on the G32 and the interchangeability of the G23 .40 barrel and mags. I believe I would rather purchase the G32, then buy a .40 barrel, rather than buy the G23 and buy a .357 SIG barrel. The cost of the ammo is a little higher, but not THAT much more.
  2. DubfromGA
    "Great info"
    interesting read

    I've wanted a .357 Sig for a while now and this may have been what temps me to go ahead.

    It'd make for a decent woods gun possibly, as well.

    I'll look around at possible 40 cal offerings and see if a .357 barrel doesn't find its way, too.
  3. Kentucky Shooter
    "Very informative Article"
    I learned more about the .357 SIG by reading this article and come to realize which Glock models can easily be converted to shoot this cartridge. Didnt realize until now that no magazine change is needed. The velocity of this cartridge is very impressive. Would love to pull the trigger on a 100 yard target to see what type of trajectory it would have. Nice article, nice job!


To make a comment simply sign up and become a member!
  1. jeremiahjj
    I've seen ballistic reports from DoubleTap, etc., and the .357 Sig caliber with the 125-gr. projective beats 'em all in both velocity and energy. High ammo price is the only objection.
  2. wganz
    You missed the .38-40, the original forty, as a necked down .44-40.
      Overkill338 likes this.
    1. Overkill338
      I mentioned the 38-40 in my 10mm Auto article but forgot it here.
  3. StLJohn
    Another good article both interesting and informative. Been thinking of getting the .357 Sig as an addition to my stable of autoloaders, and will start by converting my G22. Depending upon how that goes, maybe a 33 or 27 conversion?
  4. TheDreadnought
    You need to cite your sources.

    You claim .357 Mag is #1 for 1 shot stops in history. Is this just your opinion? If not, cite your source. If you don't have a source, you probably shouldn't present it as fact.
      RACHIGER likes this.
    1. Overkill338
      It's pretty common knowledge to everyone, but since I didn't, Google it. I'm sorry about that.
    2. my_old_glock
    3. TheDreadnought
      That's a WIDELY disputed report.
  5. my_old_glock
    If you reload, you can resize 357 Magnum bullets down to size using a LEE push-thru sizer (0.356). I have used several different types of 357 Magnum bullets in my 9mm guns without problems. The only one I found that didn't work/feed in my G26/17 was the Speer 135gr GD HP SB bullet (#4014) because the nose was too large, but it should work in a bottle-neck cartridge - although I see no reason for using a Short-Barrel/Low-Velocity bullet at high velocities. I have used Hornady 140gr XTP (#35740) bullets with no problems. I have not gel tested any of those bullets, but they should behave the same as they do from a 357 Magnum cartridge of the same velocity.

    FMJ will always hold up at high velocities.

      StLJohn and Overkill338 like this.
    1. Overkill338
      Thanks for the reply, I'm just an amateur writer.