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357 SIG

.357 Sig ammo was jointly designed by Swiss firearms manufacturer Sig Sauer and the Federal Cartridge Corporation. The intent of the designers was a cartridge comparable to the .357 Magnum and capable of firing from semi-automatic handguns.

The .357 Sig round is derived from the case of the .40 S&W, necked-down and slightly elongated. This bottlenecked case design makes .357 Sig ammunition exceptionally reliable when feeding in semi-automatic firearms.

While the original ammunition utilized a .357 diameter bullet, the design was quickly revised to utilize .355 caliber (9mm) bullets which are typically shorter than standard 9mm bullets due to the length of the case neck. Most bullets used in .357 Sig are truncated cones, whether FMJ or hollow-point.

Common weights for .357 Sig projectiles are 115-grain, 125-grain and 147-grain. The heavier bullets are capable of exceeding 1200 feet per second muzzle velocity out of common barrel lengths, while the lighter bullets can reach over 1600 feet per second. Muzzle energy for the various loadings ranges from just below 500 foot-lbs to over 600 foot-lbs.

Adopted by numerous law enforcement agencies, including the Texas Highway Patrol, US Secret Service and Federal Air Marshals, .357 Sig ammo is ideally suited to duty and personal defense. Its combination of weight and velocity marks it as a hard-hitting caliber, while its notable case dimensions make it one of the most reliable pistol calibers in existence.

Check out our in-stock 357 Sig ammo for sale below from major manufacturers like Federal, Sig Sauer and others:

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16 Items

  1. 1000rds - 357 Sig Speer Lawman 125gr. TMJ Ammo 1000rds - 357 Sig Speer Lawman 125gr. TMJ Ammo
    $569.95
    $0.57/ppr

    ☆☆☆☆☆ 1 Review

    6 In Stock

    ☆☆☆☆☆ 1 Review

    Bullet type
    Total Metal Jacket (TMJ)     Muzzle Energy
    506     Casing Type
    Brass     Muzzle Velocity
    1350     Primer Type
    Boxer     Bullet Weight
    125 Grain
  2. 1000rds - 357 Sig Sellier & Bellot 140gr FMJ Ammo 1000rds - 357 Sig Sellier & Bellot 140gr FMJ Ammo
    $589.95
    $0.59/ppr

    13 In Stock

    Bullet type
    Full Metal Jacket (FMJ)     Muzzle Energy
    568     Casing Type
    Brass     Muzzle Velocity
    1352     Primer Type
    Boxer     Bullet Weight
    140 Grain
  3. 1000rds – 357 Sig Federal American Eagle 125gr. FMJ Ammo 1000rds – 357 Sig Federal American Eagle 125gr. FMJ Ammo
    $594.95
    $0.59/ppr

    15 In Stock

    Bullet type
    Full Metal Jacket (FMJ)     Muzzle Energy
    506     Casing Type
    Brass     Muzzle Velocity
    1350     Primer Type
    Boxer     Bullet Weight
    125 Grain
  4. 1000rds - 357 Sig Fiocchi 124gr. FMJ Ammo 1000rds - 357 Sig Fiocchi 124gr. FMJ Ammo
    $609.95
    $0.61/ppr

    3 In Stock

    Bullet type
    Full Metal Jacket (FMJ)     Muzzle Energy
    505     Casing Type
    Brass     Muzzle Velocity
    1350     Primer Type
    Boxer     Bullet Weight
    124 Grain
  5. 50rds - 357 Sig Speer Lawman 125gr. TMJ Ammo 50rds - 357 Sig Speer Lawman 125gr. TMJ Ammo
    $32.95
    $0.66/ppr

    101 In Stock

    Bullet type
    Total Metal Jacket (TMJ)     Muzzle Energy
    506     Casing Type
    Brass     Muzzle Velocity
    1350     Primer Type
    Boxer     Bullet Weight
    125 Grain
  6. 50rds – 357 Sig Speer Lawman Clean-Fire 125gr. TMJ Ammo 50rds – 357 Sig Speer Lawman Clean-Fire 125gr. TMJ Ammo
    $33.95
    $0.68/ppr

    160 In Stock

    Bullet type
    Total Metal Jacket (TMJ)     Muzzle Energy
    506     Casing Type
    Brass     Muzzle Velocity
    1350     Primer Type
    Boxer     Bullet Weight
    125 Grain
  7. 50rds - 357 Sig Fiocchi 124gr. FMJ Ammo 50rds - 357 Sig Fiocchi 124gr. FMJ Ammo
    $34.95
    $0.7/ppr

    164 In Stock

    Bullet type
    Full Metal Jacket Truncated Cone (FMJTC)     Muzzle Energy
    506     Casing Type
    Brass     Muzzle Velocity
    1350     Primer Type
    Boxer     Bullet Weight
    124 Grain
  8. 50rds - .357 Sig Sellier & Bellot 140gr. FMJ Ammo 50rds - .357 Sig Sellier & Bellot 140gr. FMJ Ammo
    $34.95
    $0.7/ppr

    ☆☆☆☆☆ 2 Reviews

    148 In Stock

    ☆☆☆☆☆ 2 Reviews

    Bullet type
    Full Metal Jacket (FMJ)     Muzzle Energy
    568     Casing Type
    Brass     Muzzle Velocity
    1352     Primer Type
    Boxer     Bullet Weight
    140 Grain
  9. 50rds – 357 Sig Sellier & Bellot 124gr. JHP Ammo 50rds – 357 Sig Sellier & Bellot 124gr. JHP Ammo
    $35.55
    $0.71/ppr

    24 In Stock

    Bullet type
    Jacketed Hollow-Point (JHP)     Muzzle Energy
    597     Casing Type
    Brass     Muzzle Velocity
    1476     Primer Type
    Boxer     Bullet Weight
    124 Grain
  10. 50rds – 357 SIG Speer Gold Dot LE 125gr. JHP Ammo 50rds – 357 SIG Speer Gold Dot LE 125gr. JHP Ammo
    $40.95
    $0.82/ppr

    122 In Stock

    Bullet type
    Jacketed Hollow-Point (JHP)     Muzzle Energy
    525     Casing Type
    Nickel-Plated Brass     Muzzle Velocity
    1375     Primer Type
    Boxer     Bullet Weight
    125 Grain
  11. 50rds - 357 Sig Federal LE Tactical HST 125gr. Hollow Point Ammo 50rds - 357 Sig Federal LE Tactical HST 125gr. Hollow Point Ammo
    $40.95
    $0.82/ppr

    ☆☆☆☆☆ 6 Reviews

    97 In Stock

    ☆☆☆☆☆ 6 Reviews

    Bullet type
    Jacketed Hollow-Point (JHP)     Muzzle Energy
    513     Casing Type
    Nickel-Plated Brass     Muzzle Velocity
    1360     Primer Type
    Boxer     Bullet Weight
    125 Grain
  12. 50rds - 357 Sig Remington UMC 125gr. FMJ Ammo 50rds - 357 Sig Remington UMC 125gr. FMJ Ammo
    $54.95
    $1.10/ppr

    83 In Stock

    Bullet type
    Full Metal Jacket (FMJ)     Muzzle Energy
    506     Casing Type
    Brass     Muzzle Velocity
    1350     Primer Type
    Boxer     Bullet Weight
    125 Grain
  13. 50rds - 357 Sig Winchester USA 125gr. FMJ Ammo 50rds - 357 Sig Winchester USA 125gr. FMJ Ammo
    $54.95
    $1.1/ppr

    70 In Stock

    Bullet type
    Full Metal Jacket (FMJ)     Casing Type
    Brass     Muzzle Velocity
    1350     Primer Type
    Boxer     Bullet Weight
    125 Grain
  14. 20rds - 357 Sig Corbon 115gr. HP Ammo 20rds - 357 Sig Corbon 115gr. HP Ammo
    $23.00
    $1.15/ppr

    28 In Stock

    Bullet type
    Jacketed Hollow-Point (JHP)     Muzzle Energy
    575     Casing Type
    Brass     Muzzle Velocity
    1500     Primer Type
    Boxer     Bullet Weight
    115 Grain
  15. 20rds – 357 Sig Hornady Critical Duty 135gr. FlexLock Ammo 20rds – 357 Sig Hornady Critical Duty 135gr. FlexLock Ammo
    $31.95
    $1.6/ppr

    167 In Stock

    Bullet type
    Jacketed Hollow-Point (JHP)     Muzzle Energy
    450     Casing Type
    Nickel-Plated Brass     Muzzle Velocity
    1225     Primer Type
    Boxer     Bullet Weight
    135 Grain
  16. 20rds – 357 Sig Federal Personal Defense HST 125gr. JHP Ammo 20rds – 357 Sig Federal Personal Defense HST 125gr. JHP Ammo
    $34.95
    $1.75/ppr

    ☆☆☆☆☆ 1 Review

    50 In Stock

    ☆☆☆☆☆ 1 Review

    Bullet type
    Jacketed Hollow-Point (JHP)     Muzzle Energy
    513     Casing Type
    Nickel-Plated Brass     Muzzle Velocity
    1360     Primer Type
    Boxer     Bullet Weight
    125 Grain

16 Items

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More on 357 Sig Ammo

Is there a Difference Between .357 Sig and the .357 Magnum?

Yes. While they both use the “.357” monicker, these are two cartridges that are distinct and unique. Compared to .357 Magnum ammo, the .357 Sig has different dimensions for bullet diameter, case diameter and rim diameter. The most notable difference is the narrow neck of the .357 Sig, which is “necked-down,” meaning the case is wider and narrows at the front before wrapping around the bullet. Because of the unique shape, as well as the different dimensions, the .357 Sig and .357 Magnum are not interchangeable at all. Get more details about 357 sig vs. 357 mag calibers here.

What is the Purpose of the Narrow Neck?

The most distinct feature of the .357 Sig ammo is the presence of the shoulders. Basically, the cartridge case is wider towards the back and then narrows to form what could be described as a shoulder and neck. The .357 Sig was based on a wider cartridge that was fitted to hold a smaller bullet. The result was that with a wider cartridge, more propellant could be packed behind the lighter projectile, creating superior velocities without lengthening the cartridge itself. Because of the unique shape (most handgun ammo is not necked), the .357 Sig remains a bit of an oddity in the firearms industry.

How Does .357 Sig Ammo Compare to the 9mm Luger?

The .357 Sig uses a bullet that is similar in diameter to the 9mm Luger. However, the 9mm Luger does not have the necking, and has a smaller case diameter. The increase in case diameter, and hence the amount of propellant, means the .357 Sig is generally faster and more powerful than the 9mm Luger.

How Does the .357 Sig Compare to the 10mm Auto?

At the base, the cartridges are similar in size, but the .357 Sig narrows towards the front and holds a bullet that is smaller in diameter. Because of the narrowed neck, the .357 Sig has a narrower bullet that is generally smaller in overall weight. The .357 Sig tends to be slightly faster in muzzle velocity, although the 10mm Auto generally delivers stronger muzzle energy, due in large part to the heavier bullet.

Can the .357 Sig Be Used for Self Defense?

Absolutely. .357 Sig ammunition is perfectly capable of providing effective self defense. With ballistics that make is comparable to many other popular rounds, the .357 Sig, however obscure, can be extremely effective when called upon. If purchasing this ammo for personal protection, select expanding rounds such as jacketed hollow points or soft points.

Recent 357 SIG Reviews

  • ☆☆☆☆☆
    This is some serious stuff. It’ll put down some bad hombres.
    Brett M on 20rds – 357 Sig Federal Personal Defense HST 125gr. JHP Ammo
  • ☆☆☆☆☆
    They work well... and make a big mess....
    ASF on 20rds - 357 SIG G2 Research RIP 92gr. HP LF Ammo
  • ☆☆☆☆☆
    Absolutely incredible ammunition. Have carried my German Sig P229 since 1996 cal .357 sig. Like this weapon so much purchased a second German P229 which remains unfired today. Chronographs at just over 1400 f.p.s. with Hornady load. Just below 1400 f.p.s. with Speer Gold dot. A former deputy sheriff I remember well the transition between the .357 mag and the 9 m/m. In the transition period, (1980's) the 9 m/m ammo had a bad reputation for stopping power. Not today, however the .357 Sig easily eclipses any 9m/m load out there. If loaded where it should be, the 9 m/m suffers an easy 200 / 250 f.p.s. to the .357 Sig. Accuracy wise the .357 Sig easily outperforms the 9 m/m. .357 Sig also much more snappy! Secret Service loves it, U.S. Air Marshalls love it, Texas Rangers love it. I love it. "Nuff said.
    Tim Hardy on 50rds - 357 Sig Federal LE Tactical HST 125gr. Hollow Point Ammo
  • ☆☆☆☆☆
    While I’ve never had to use this for its intended purpose I have shot enough of this ammo at the range to feel like it would perform well if the need arose. It’s shoots well and accurately in both my Sig P239 and Glock 23 (with a 357 drop in barrel). I can’t discern much difference recoil wise between the 40, the 9mm and the 357 Sig. Is it louder? I wear ear pro so how can I tell?! Many LE officers like the 357 Sig so I’ll defer to their judgement. A 357 Sig with a spare mag sleeps in my bed stand but when the ATF gets around to granting me my tax stamp the nightstand gun will be a suppressed 9mm......probably a CZ Scorpion Evo 3 S1, Obsidian 45 suppressor, 30 rd mag with a full spare and a light......it’s a crazy world these days! My life matters ???? So.....I digress. The Winchester ammo works just fine.
    John T Turner on 50rds - 357 Sig Winchester Ranger 125gr. Bonded Hollow Point Ammo