Privacy guaranteed - Your email is not shared with anyone.

Welcome to Glock Forum at

Why should YOU join our forums?

  • Reason #1
  • Reason #2
  • Reason #3

Site Description

Glock 31 .357 Sig

Discussion in 'General Glocking' started by MustangDaddy, Jan 29, 2013.

  1. Reality is, 357SIG performance is basically the same as 9mm +P+. Other than maybe a little extra noise from the 357SIG, if you were shooting either out of the 31, you wouldnt know which was which shooting wise.

    One thing to keep an eye on with the 31 is the underside of the slide where the locking block tends to hit it. My 31 was beating itself to death here, and showed no signs of slowing down, though I was told by a number of people it would. It was peening the slide pretty heavily, and it was deforming the slide enough, that you could easily cut your finger on the sharp edges if you ran your finger across them with just a little pressure.

    My one 17, which has more +P+ 9mm through it at this point than my 31 had 357SIG, shows only some minor finish wear in the same spot.

    357SIG ammo was at one point, the eact same price as .40, when you bought it by the case. I bought a lot of both when it was $250/1000. I sold both off when 357SIG hit close to $600/1000 and .40 wasnt to far behind, back during the last "shortage". Made out quite well too. I know its come back down some, but its still pretty pricey.

    Even reloading aint all that cheap these days, especially since they use caliber specific bullets that tend to cost a good bit more. You can use some 9mm bullets, if the profile is right, but most arent. 147 grain bullets are closer to the correct profile, but I never had any luck with them accuracy wise. My guns always shot best using Speer 125 grain 357SIG TMJ's over AA #9.
  2. M1fuzz


    Dec 15, 2007
    My 40 G22 does the same thing to the slide as your 357 was. No biggie. It will stop. Glock won't replace ubless cracked. There are 124 or 125 grain 9mm bullets that fit the needed profile for the round. I use Missouri Bullets IDPA #6 with good luck. Have gotten good accuracy with 147 grain using AAC#9. Been using Bullseye with good results lately. To original op, good choice in caliber or gun.

  3. jeffreybehr

    jeffreybehr Silver Member

    Mar 14, 2009
    Phoenix, AZ USA
    I carry a 5.2"-barreled 31G4. What over-penetration? Only if you use FMJs, and only an idiot would use them for PD.
  4. dkf


    Aug 6, 2010
    I have the 31, 32 and 33 but carry the 33 the most. You don't really have to worry about over penetration with most of the major manufacturer JHPs.

    However in the G33 you may want to stay away from the GD 54234 and the 147gr Hornady custom and tap loads. Those will most likely go well over 18". The Federal HST is the best round I have found for the G33 and it works great in the 31 and 32 also.

    A HST I shot out my G33 into wetpack expanded to an average of .700" and did not over penetrate.
    Last edited: Jan 29, 2013
  5. Rev.357


    Jan 14, 2012
    Heath Springs SC
    The G31 is my #1 gun & the more you shoot it the more you will love it! Have fun :wavey:
  6. AustinTx


    Aug 16, 2006
    Buy a 40 S&W barrel, of your choice and you won't need a G22.
  7. warner41


    Jan 27, 2013
    I picked up a new Gen4 G22 upper with the intent of buying a Gen4 G31 soon. The 31 will definitely be my next complete purchase. Parts to finish some other builds I have in the works is another story.
  8. recently replaced my 4 year old gen3 31 with a gen4 31. threw the gen3 back in the department's armory.

    still carrying a gen3 32 or gen3 33 for off-duty. will probably put those in storage and get the gen4 32 and gen4 33.
  9. Meanie5470


    Jun 27, 2009
    New Jerzee
    I love .357 sig. I have a g31 barrel that I use in my g22. The .357 and .40 mags are the same too. Might be good to know if youre looking for mags because g22 mags are way more common.
  10. Meanie5470


    Jun 27, 2009
    New Jerzee
    The g31 and g22 are identical aside from the barrel. Thats the only thing you need to swap to shoot the other caliber. Mags are the same too.
  11. roberev


    Mar 31, 2009
    G33 with Federal HST is my EDC. I am not overly concerned with over penetration given that the Virginia State Police and Richmond Police both carry this caliber. I have defended police officers involved in shootings using this caliber and never have seen anything in the medical records or ballistics reports that indicated overpenetration.


    Sent from my DROID BIONIC using Tapatalk 2
  12. legalsten


    Jan 7, 2012
    I bought a 32 C to carry and had it shipped to a local FFL . While it was being shipped I found a 33 and just had to have it. They had a used mag for a 32 with the sleeve so it fit the 33 . It is my main carry gun now .

    I bought the 357 because it is a really good cartridge and I hadn't planned on reloading for it. Most say that a bottle neck cartridge feeds better than the others so chance of a FTF is slim. I can easily go to a 40 with a barrel and a 9mm with a conversion barrel and magazine.

    I did get a good deal on a 36 so I will have to carry it for a few days .
  13. AustinTx


    Aug 16, 2006
    G22 mags are, way, more common. There weren't any pre-ban 357 SIG mags made, for the common people. I had to use G22 mags, for over 10 rounds.


    Oct 19, 2008
    20SF with a 357 Sig barrel. Soft shooting!
  15. Racefan


    Jan 15, 2013
    This is the info I was looking for - I'm mainly focusing on having plenty of 9mm around for my G19 and G26, but I want a third gun that's flexible on caliber for situations where 9mm gets hard to find. I also want to try a "full size" frame Glock.

    So the G31 can shoot .40 with only a barrel change with either G31 or G22 mags? Can it also shoot 9mm with a barrel and G19 15-round mags, or will it need G17 mags?
  16. legalsten


    Jan 7, 2012
    As long as you get a conversion barrel. They are a larger outside diameter to fit the 40 / 357 slide. They do something so the 9 works with the 357 & 40 ejector . Not sure what .

    You will need G 17 mags , the others are too short . On the bright side the G 17 mags will work in your others .
  17. MustangDaddy


    Aug 3, 2005
    Well....gave the .357 Sig a try....liked it alot but didn't see the justification for keeping it vs .40SW. The cost of and availability of ammo as compared to the .40 ultimately lead me to get rid of the new G31 and go back to the good ole .40 G22. My 9's and .40 have always and still continue to serve me well for my needs and I will just stick with them.
  18. Giggity-Giggity

    Giggity-Giggity Giggity-Goo!!!

    Feb 2, 2007
    Gun Tot'n in Quohog
    Congrats! I'm a fan too. Nice and clean:
  19. The Gemini

    The Gemini

    Nov 9, 2010
    Sooooo, in a six week period, you go from having a "keeper for sure", to getting rid of it? During the craziest time in history concerning guns/ammunition cost & availability?


    Posted using Outdoor Hub Campfire
  20. MustangDaddy


    Aug 3, 2005
    Yup.....Your point of ammo cost and availability was one of my reasons for switching back to .40 from the .357Sig as stated in my post. The .40 is more available and alot cheaper in my area......WOW