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357 mag Vs 357 sig

Discussion in 'Caliber Corner' started by GoonGlock21, Mar 31, 2010.

  1. GoonGlock21

    GoonGlock21

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    Im up in the air on getting a g32 or a new 357 rev. what are yalls opinons on the two 357 rounds? how do the ballistics match up? etc.
     
  2. SgtSam

    SgtSam

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    Apples to Oranges, really. The only place that the two come close ballistically, is with the 125gr load that the SIG is known for. Outside of that, I think the .357 Mag is ballistically superior, and a hell of lot more versatile. Plus, with the .357 Mag, you can shoot .38 Spl.

    And then you have the platform. Pistol vs revolver. They really aren't comparable. Pro's and Con's to both. Lot's of them.

    I know a lot of people disagree, but I can't help but feel that the .357 Sig, for MOST of us, answers a question that was never asked, let alone even thought of. Yeah, I know, it's found a home with a number of LE departments. But, they don't need versatility as they have one mission and one purpose in a handgun. Most of us need the versatility.

    But, good luck on your search for an answer. I hope however you work it out, you're happy with the decision over the long haul.

    SgtSam
     

  3. fredj338

    fredj338

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    Using a 4" 357mag vs 3.5"-4" 357sig & 125gr JHP, pretty close. In a 357mag snub, the 357sig wins hands down. The 357sig gives you an easier gun to conceal & shoot plus more rounds. I love the 357mag, but I am really liking the 357sig for CCW. Some comparisonsin size, M66, P239 & M19.Smolt, 6rds vs 8rds in a smaller pkg:

    [​IMG]
     
    Last edited: Apr 1, 2010
  4. Glolt20-91

    Glolt20-91

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    Old tech Remington 125gr SJHP that doesn't plug up can be bought at Walmart. Chronograph from 4" barrel is 1465fps and 1610fps from a 6".

    If you choose to handload, cost of .357mag brass is about the same as 9mm +P brass; both significantly lower in cost than the SIG when ordered directly from Starline.

    The .357mag is far more versatile in bullet/ammo selection than its SIG cousin.

    Add the additional cost of magazines plus several hundred rounds of you carry ammo, reliability testing, and the price of a S&W M686 becomes very competitive.

    My 686 plus came with adjustable sights, drilled and tapped for optics, target trigger and hammer; first shot accuracy out to 160 yards from multiple shooters.

    Bob :cowboy:
     
  5. N/Apower

    N/Apower

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    Having shot 357SIG, and 357Magnum, from a 6" barrel, the 357 Magnum is going to shine. Anything less than a 6" barrel, go with the 357SIG. Unless you are hunting with it, and need to use 180gr Cast bullets or something--but then, why would you hunt something with a 4" revolver?

    The auto-pistol offers less muzzle-flip. Higher capacity.
    The Revolver offers more velocity in longer barrel-lengths, and the ability to shoot 180gr ammo.
     
  6. N/Apower

    N/Apower

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    I have seen chronograph numbers from 125gr Rem SJHP running mid 1300's for a 4" barrel as well. Barrel/cylinder gap is going to play a role here, as well. For the most part, I would say that the two rounds are about equal from a 4" barrel. But then, most autos are 3.8" or 4.4", or so.
     
  7. unit1069

    unit1069

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    The .357sig has answered my question, "Where do I find the equivalent of the 125-grain Magnum round but in a configuration that gives me more than double the capacity of a revolver while cutting the total weight of the firearm"?

    I can understand why many LEO are switching to .357sig.
     
  8. MinervaDoe

    MinervaDoe

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    :popcorn::dancing:
    I've got two .357 magnums and I'm really enjoying learning about the .357 sig. In that self defense niche which is topped by the 125 grain .357 magnum, the .357 sig looks like a really solid performer (in a high capacity auto pistol package). I'll probably start out with a .357 sig barrel in my Glock 20.
     
  9. fsqridah

    fsqridah

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    For SD, definitely the .357 SIG. For hunting, the .357 magnum.

    For anyone who says it's an answer to a question never asked, that's just ridiculous. You can say the same thing about pretty much any cartridge out there. Look at all the 30-caliber stuff. .30 carbine, .303 British, .300 Wby magnum, .30-30, 7.62x39, 7.62x54R, .308, .30-06, .300 win mag, .300 WSM, .300 RUM, .300 RSAUM...I'm sure I've missed a few. I mean, they're all 30-caliber rifles...do we really need all of them? Probably not, but they all satisfy a particular need for particular people. If the .45 ACP was so awesome and perfect and fitting, we wouldn't have any other handgun caliber because nobody would need it.

    The .357 SIG does exactly what it was designed to do...replicate .357 magnum ballistics from a 4" barrel with a 125gr bullet. The original standard of the .357 magnum was a 125gr bullet @ 1400fps from a 4" barrel achieving 544 lb/ft of energy at the muzzle. A G32 with a 4.02" barrel can easily push a 125gr bullet @ 1400fps. You also need to remember that a 4" revolver has more barrel than a 4" auto. So making things equal, a 4.75" auto versus a 4" revolver is a better comparison. So based on external ballistics, the .357 SIG does just as well with a 125gr bullet.

    Now once you move up in bullet weights and start shooting 158gr bullets, the .357 magnum wins every time. There's just not enough case capacity in the .357 SIG to push 158gr bullets as fast as the magnum. Also, the revolver has the ability to use SJHPs, which have more violent upsets in tissue than JHPs. So based on terminal performance, the .357 magnum is more effective by most people's standards. It is more versatile because of higher case capacity (like a .30-06 versus a .308). And as said, you can run a .38 spl through it with no problems. However, with a .357 SIG, you have the distinct ability to swap your barrel and run a .40 or swap the barrel/mags and run a 9mm. You can't do that with the revolver. And of course you have the higher ammo capacity, faster reloads, and less recoil.

    I think the reason that .357 SIG hasn't caught on is because of the high ammo costs. Most just can't afford to shoot it. If you made 9x19 $30/50 rounds and .357 SIG $13/50 rounds, what do you think people would start shooting?

    Get the SIG...you'll love it.

    Dude, forget the .357 SIG. Get a 9x25 Dillon barrel and send 115gr bullets down the range at 1700-1800fps. The 10mm itself is badass, but the platform gives you endless possibilities. Or you could be a d-bag and get the .50GI conversion from Guncrafter Industries. Possibly the dumbest thing I've ever seen, but I'm sure it gets them plenty of business.
     
    Last edited: Mar 31, 2010
  10. MrVvrroomm

    MrVvrroomm

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    [​IMG]

    [​IMG]

    Then there's this. Try this load...357mag, 22gr Win296, SPM primer, 125gr JHP, OAL 1.590"

    That round comes out the end of the barrel right at about 2000 fps.

    I have .357 mag revolvers and .357 sig Glocks. Neither can pump out a .357 projectile like my Coonan Model B.
     
  11. fredj338

    fredj338

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    Last edited: Apr 1, 2010
  12. English

    English

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    As said above, the two are nearly identical with 4" barrels and 125gn bullets with all the advantages of cartridge number, weight and size to the SIG. The magnum looses too much to the cylinder gap for its extra effective barrel length to make up.

    Once you move to larger gn bullets and longer barrels, the extra case capacity and slower burning propellants make up for the cylinder gap loss and the Magnum gallops ahead.

    English
     
  13. Glolt20-91

    Glolt20-91

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    :rofl:

    What's your extreme spread?

    Nice looking piece tho.

    Bob :cowboy:
     
  14. GunFighter45ACP

    GunFighter45ACP

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    Nice Coonan!!!

    For carry, I'll stick w/357sig. My thought being if I'm OK w/the size/weight of a 4" 357mag for carry, then why not just step up to 10mm and...
     
  15. ABNAK

    ABNAK

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    Million dollar question:

    Which 125gr .357Sig loads closely duplicate a Remington or Federal 125gr SJHP load with regard to fragmenting? Obviously not bonded or Gold Dots.

    Oh, and before you say Cor Bon keep in mind they were known for using Sierra JHP's but 2 new boxes of .40 165gr HP's I got recently were loaded with freakin' Gold Dots (which I hate for expansion) due to Sierra's inability to keep up with Cor Bon's demand. Not sure if it was just for .40 though, as I didn't ask when I called.
     
    Last edited: Apr 1, 2010
  16. MinervaDoe

    MinervaDoe

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    from 2001 .... I'm not sure what is available now ...
     
    Last edited: Apr 1, 2010
  17. ABNAK

    ABNAK

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    Thanks!

    IIRC Triton is out of business and what remains is whether Cor Bon uses Sierras or Gold Dots.
     
  18. fredj338

    fredj338

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    If you like fragmenting type JHP, then go w/ the std. offerings by Win, Fed or Corbon. They all frag to a certain extent. Non are bonded that I know of. The 124grXTP doesn't frag but does expand nicely @ 1350fps.
     
  19. ABNAK

    ABNAK

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    What kind of velocities does the Federal and Winnie rounds achieve out of a 4" barrel? These are the standard loads, right? Not their premium line like Rangers or HST?
     
  20. fredj338

    fredj338

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    Correct, non bonded, approx 1350fps+.
     
    Last edited: Apr 2, 2010