.357 SIG Ammo Review

In a recent article, I wrote about the Glock 19 vs the SIG P229 9mm, both of whom I own, but my father recently hooked me on to .357 and I’m considering switching the P229 or even my Glock 19 gen 4 to that caliber. I don’t have vast experience with the .357, but I’ve come to enjoy shooting it. My dad, who is a veteran self-defense gun instructor, along with many law enforcement professionals (including the Secret Service) believe the .357 has just the right combination of features to make it a near perfect self-defense round. This is my .357 SIG Ammo Review.

In the early 90’s, SIG SAUER executive Ted Rowe noticed police departments had begun replacing their six-shot .357 Magnum revolvers to SIG’s higher round capacity 9mm and .45 ACP pistols. This was not without certain misgivings and yearnings for the venerable six-shooters. Many officers said they missed the vaunted stopping power of the 125-grain Magnum round. Rowe took note and set about the task of offering an alternative.

Rowe got SIG to collaborate with Federal Cartridge, and the result was the .357 SIG round unveiled in 1994. Its bottlenecked case allowed enough power to drive a 125-grain .355″ 9mm bullet 1,350 to 1,450 fps out of a service pistol. The .357 SIG was not revolutionary in its basic design. Bottlenecked pistol cartridges have been around as long as the self-loading pistol, which has existed since the late 1800s. The design allows a smaller bullet to travel as fast as a larger caliber bullet. The .357 SIG is essentially, but not exactly, a .40 S&W necked down to 9mm, although the case has to be about thick hair length longer than a .40 just to have the dimensions work out properly. What was new was that it allowed a semiauto pistol cartridge to match a revolver, specifically the .357 Magnum with a 125-grain jacketed hollowpoint, in performance and stopping power.

.357 SIG Equals Higher Velocity

These bullets fly!

These bullets fly!

The .357 SIG has higher velocity and achieves higher energy levels. Since energy is generally considered closely related to stopping power, then it is no wonder many Law enforcement agencies chose the .357 SIG over the slower and heavier .45 ACP. Not only is it a speedy little round, the bottleneck shape makes feeding issues virtually non-existent. Today, there are more state police/highway patrol units issuing the .357 SIG than issuing .45 ACP, and the .357 round is second only to .40 S&W in popularity among many state trooper agencies.

When I fire the .357, I feel that the recoil is certainly more than my 9mm, but about the same for my .40 S&W. It must be noted that I also have much less experience firing the .357, and I’m sure it will become more comfortable with time and practice. Shooters keep debating back and forth on whether the .357 SIG or the 40 S&W kicks more, but this only shows how the two rounds are really in the same ballpark in that regard. Felt recoil is always a subjective matter though, so some people think this way or the other and both are correct. What is generally agreed upon is that the.357 SIG can be tougher on the gun. This is another point that has to be kept in mind when considering the over-all cost and weighing pros and cons of this ammo. Glock suggests armorers replace recoil springs on the .357s roughly every 2,000 rounds.

The ammo price itself is a catch 22- It is in lower demand (and availability) because it is expensive, but it is also expensive because it is in lower demand. Luckily, you don’t have to go broke shelling out for .357 to shoot at the range. By simply purchasing a new barrel, you can swap from .357 SIG to the cheaper .40 S&W for target practice, then vice versa again. Magazines will usually interchange between the two calibers, though the little SIG P239 is a notable exception.

As I practiced a bit more with the .357, I found it to be a remarkably accurate cartridge. I fired the .357 SIG P229 and I was able to put five 125-grain rounds into just over 1″ at 25 yards. The .357 SIG outperformed the 9mm, .40 S&W and the .45 ACP in higher percentage success rates in accuracy and the various training scenarios my father put me through. Loaded to the same pressure as a .357 Magnum, but 14% higher than a .40 S&W or a 9mm, the .357 SIG creates quite the report when fired. As stated, the recoil is roughly similar to the .40 S&W, but certainly less than the mule kicker .357 Magnum. It can handle a 160-grain bullet, but 125-grain jacketed hollow points perform best for self-defense. Its stopping power is undeniable

How the .357 Stacks Up VS Other Rounds

get out of the way!

get out of the way!

.357 SIG vs .357 Magnum – Prior to the .357 SIG’s introduction in 1994, the .357 Magnum’s performance was unmatched by any semi-automatic pistol round. Rowe’s goal was to equal the performance of a 125-grain bullet shot from a 4-inch barrel .357 Magnum revolver out of a semi-automatic pistol, and he did a good job of that. There are many upsides to the .357 SIG round. They include a higher capacity from an easier to conceal handgun with the same stopping power police officers depended on from the .357 Magnum. The .357 SIG has the capability to travel faster than the .357 Magnum with less recoil and muzzle flash.

.357 SIG vs .40 S&W – Law enforcement agencies were looking for a round that could penetrate well, and the .357 SIG could penetrate barriers such as car metal, windshields and heavier clothing that the .40 S&W (and even .45 ACP) could not. The .357 SIG can also be loaded to higher pressures than the .40 S&W. Plus a full capacity magazine loaded with .357 SIG weighs less than a full magazine of .40. Due to the similarities, .357 SIG guns can convert to .40 S&W with a barrel swap. This allows you to save money firing the cheaper .40 S&W for practice.

If you want to simply understand the benefit of .357 SIG, just think this. It’s got the magazine capacity of a .40 S&W in any given gun, and it has a 200 to 400 foot per second velocity advantage over 9mm, depending on the load. While .357 SIG can’t match the specs of 158- grain .357 Magnum loads, it does compare favorably with 125 grain .357 Magnum. With that said, here’s how the .357 SIG stacks up against some other common cartridges:

  • .357 SIG with 125-grain bullet at 1,450 fps: 583.7 ft-lbs.
  • .40 S&W with 180-grain bullet at 1,050 fps: 440.7 ft-lbs.
  • .45 ACP with 230-grain bullet at 850 fps: 369 ft-lbs.
  • 9mm with 115-grain bullet at 1,150 fps: 337.8 ft-lbs

Some consider the .357 SIG a niche caliber, however, it is certainly one that performs to a greater expectation for law enforcement than other self-defense rounds. The extra velocity of the .357 SIG gives it better penetration performance over slower rounds such as the 9mm and .40 S&W. The .357 is indeed a good round, and highly potent, but the high cost of limited ammo choice plus the increased difficulty in reloading makes it a less than popular round.

You need to figure out whether or not it suits you. Law enforcement agencies at local, state and federal level use it, and they have to meet the requirements of a broad cross section of shooters, so that says something. If you’re coming from a 9mm background, keep in mind that it operates at the higher level of the handgun recoil scale, and it takes practice commitment to handle proficiently (as does any gun to be frank). After all, the only thing that counts is getting hits on target. If you can do that, then all the other things like velocity and expansion results don’t matter. For me, I’m going to go ahead and replace my SIG Sauer P229 9mm. I got hooked on the .357 SIG cartridge. The superior grip ergonomics of the P229, combined with the solid extra weight and real metal construction make it a great .357 SIG shooter.

worth the money you shell out

worth the money you shell out

The .357 SIG is one of the most tactically sound cartridges on the market today. Given its ballistic performance, low recoil for fast follow up shots, incredible accuracy and capacity capability, not to mention its incredible real world performance; it gets a high score in my book. Plus being able to swap out barrels to the abundant and cheaper 40 S&W for plinking and practice and still being able to use the same magazines is a huge bonus.

(Sticking to 9mm? Check out our review of the SIG Sauer P228 another amazing gun made by SIG Sauer)

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